Finding the Fourth Proportional to 113,439.27, 169,861.62 and 79,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   113,439.27 : 169,861.62 = 79,978.17 : x
2. Step 2: Convert to fraction form
   113,439.27/169,861.62 = 79,978.17/x
3. Step 3: Cross multiply
   113,439.27x = 169,861.62 × 79,978.17
4. Step 4: Simplify right side
   113,439.27x = 13,585,221,520.84
5. Step 5: Solve for x
   x = 13,585,221,520.84/113,439.27
6. Step 6: Final answer
   x = 119,757.66