Finding the Fourth Proportional to 113,128.85, 156,108.71 and 65,385.29

Step by Step Solution

1. Step 1: Write the proportion equation
   113,128.85 : 156,108.71 = 65,385.29 : x
2. Step 2: Convert to fraction form
   113,128.85/156,108.71 = 65,385.29/x
3. Step 3: Cross multiply
   113,128.85x = 156,108.71 × 65,385.29
4. Step 4: Simplify right side
   113,128.85x = 10,207,212,752.81
5. Step 5: Solve for x
   x = 10,207,212,752.81/113,128.85
6. Step 6: Final answer
   x = 90,226.44