Finding the Fourth Proportional to 113,632.62, 156,755.34 and 86,728.43

Step by Step Solution

1. Step 1: Write the proportion equation
   113,632.62 : 156,755.34 = 86,728.43 : x
2. Step 2: Convert to fraction form
   113,632.62/156,755.34 = 86,728.43/x
3. Step 3: Cross multiply
   113,632.62x = 156,755.34 × 86,728.43
4. Step 4: Simplify right side
   113,632.62x = 13,595,143,748.54
5. Step 5: Solve for x
   x = 13,595,143,748.54/113,632.62
6. Step 6: Final answer
   x = 119,641.21