Finding the Fourth Proportional to 113,689, 156,891.30 and 63,391.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113,689 : 156,891.30 = 63,391.72 : x
2. Step 2: Convert to fraction form
   113,689/156,891.30 = 63,391.72/x
3. Step 3: Cross multiply
   113,689x = 156,891.30 × 63,391.72
4. Step 4: Simplify right side
   113,689x = 9,945,609,360.04
5. Step 5: Solve for x
   x = 9,945,609,360.04/113,689
6. Step 6: Final answer
   x = 87,480.84