Finding the Fourth Proportional to 100,116.38, 138,210.59 and 57,666.71

Step by Step Solution

1. Step 1: Write the proportion equation
   100,116.38 : 138,210.59 = 57,666.71 : x
2. Step 2: Convert to fraction form
   100,116.38/138,210.59 = 57,666.71/x
3. Step 3: Cross multiply
   100,116.38x = 138,210.59 × 57,666.71
4. Step 4: Simplify right side
   100,116.38x = 7,970,150,502.15
5. Step 5: Solve for x
   x = 7,970,150,502.15/100,116.38
6. Step 6: Final answer
   x = 79,608.85