Finding the Fourth Proportional to 113,883.12, 157,158.72 and 66,139.55

Step by Step Solution

1. Step 1: Write the proportion equation
   113,883.12 : 157,158.72 = 66,139.55 : x
2. Step 2: Convert to fraction form
   113,883.12/157,158.72 = 66,139.55/x
3. Step 3: Cross multiply
   113,883.12x = 157,158.72 × 66,139.55
4. Step 4: Simplify right side
   113,883.12x = 10,394,406,233.58
5. Step 5: Solve for x
   x = 10,394,406,233.58/113,883.12
6. Step 6: Final answer
   x = 91,272.58