Finding the Fourth Proportional to 113,505.64, 156,566.78 and 81,624.04

Step by Step Solution

1. Step 1: Write the proportion equation
   113,505.64 : 156,566.78 = 81,624.04 : x
2. Step 2: Convert to fraction form
   113,505.64/156,566.78 = 81,624.04/x
3. Step 3: Cross multiply
   113,505.64x = 156,566.78 × 81,624.04
4. Step 4: Simplify right side
   113,505.64x = 12,779,613,113.39
5. Step 5: Solve for x
   x = 12,779,613,113.39/113,505.64
6. Step 6: Final answer
   x = 112,590.12