Finding the Fourth Proportional to 14,385.60, 21,578.72 and 3,997.28

Step by Step Solution

1. Step 1: Write the proportion equation
   14,385.60 : 21,578.72 = 3,997.28 : x
2. Step 2: Convert to fraction form
   14,385.60/21,578.72 = 3,997.28/x
3. Step 3: Cross multiply
   14,385.60x = 21,578.72 × 3,997.28
4. Step 4: Simplify right side
   14,385.60x = 86,256,185.88
5. Step 5: Solve for x
   x = 86,256,185.88/14,385.60
6. Step 6: Final answer
   x = 5,996.01