Finding the Fourth Proportional to 21,545,216.88, 29,743,173.72 and 13,399,079.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,545,216.88 : 29,743,173.72 = 13,399,079.28 : x
2. Step 2: Convert to fraction form
   21,545,216.88/29,743,173.72 = 13,399,079.28/x
3. Step 3: Cross multiply
   21,545,216.88x = 29,743,173.72 × 13,399,079.28
4. Step 4: Simplify right side
   21,545,216.88x = 398,531,142,713,092.50
5. Step 5: Solve for x
   x = 398,531,142,713,092.50/21,545,216.88
6. Step 6: Final answer
   x = 18,497,430.08