The story never explicitly states how the peach gets its power, but it's implied to be a combination of magic and the combined efforts of the insects living inside. Here's how it works:
* Magic: The peach itself is enchanted. It's grown from a seed touched by the magic of an old, wise woman. This magic grants the peach extraordinary abilities, including the power to grow to enormous size and float.
* The Insects: The insects, with their collective strength and ingenuity, contribute to the peach's movement. They might be pushing against the inside of the peach, or possibly using some kind of unknown power within them.
Ultimately, the story doesn't focus on explaining the science behind the peach's flight, but rather on the adventure and the characters within it. It's left to the reader's imagination to decide exactly how the peach manages to soar through the sky!