Finding the Fourth Proportional to 103,002.72, 142,092.96 and 64,808.64

Step by Step Solution

1. Step 1: Write the proportion equation
   103,002.72 : 142,092.96 = 64,808.64 : x
2. Step 2: Convert to fraction form
   103,002.72/142,092.96 = 64,808.64/x
3. Step 3: Cross multiply
   103,002.72x = 142,092.96 × 64,808.64
4. Step 4: Simplify right side
   103,002.72x = 9,208,851,491.17
5. Step 5: Solve for x
   x = 9,208,851,491.17/103,002.72
6. Step 6: Final answer
   x = 89,403.96