Finding the Fourth Proportional to 103,057.28, 142,147.89 and 72,495.17

Step by Step Solution

1. Step 1: Write the proportion equation
   103,057.28 : 142,147.89 = 72,495.17 : x
2. Step 2: Convert to fraction form
   103,057.28/142,147.89 = 72,495.17/x
3. Step 3: Cross multiply
   103,057.28x = 142,147.89 × 72,495.17
4. Step 4: Simplify right side
   103,057.28x = 10,305,034,739.95
5. Step 5: Solve for x
   x = 10,305,034,739.95/103,057.28
6. Step 6: Final answer
   x = 99,993.28