Finding the Fourth Proportional to 113,509, 156,381.60 and 89,626.96

Step by Step Solution

1. Step 1: Write the proportion equation
   113,509 : 156,381.60 = 89,626.96 : x
2. Step 2: Convert to fraction form
   113,509/156,381.60 = 89,626.96/x
3. Step 3: Cross multiply
   113,509x = 156,381.60 × 89,626.96
4. Step 4: Simplify right side
   113,509x = 14,016,007,407.94
5. Step 5: Solve for x
   x = 14,016,007,407.94/113,509
6. Step 6: Final answer
   x = 123,479.26