Finding the Fourth Proportional to 113,418.50, 156,517.62 and 65,674.40

Step by Step Solution

1. Step 1: Write the proportion equation
   113,418.50 : 156,517.62 = 65,674.40 : x
2. Step 2: Convert to fraction form
   113,418.50/156,517.62 = 65,674.40/x
3. Step 3: Cross multiply
   113,418.50x = 156,517.62 × 65,674.40
4. Step 4: Simplify right side
   113,418.50x = 10,279,200,782.93
5. Step 5: Solve for x
   x = 10,279,200,782.93/113,418.50
6. Step 6: Final answer
   x = 90,630.72