Finding the Fourth Proportional to 105,700.10, 158,550.16 and 91,426.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,700.10 : 158,550.16 = 91,426.16 : x
2. Step 2: Convert to fraction form
   105,700.10/158,550.16 = 91,426.16/x
3. Step 3: Cross multiply
   105,700.10x = 158,550.16 × 91,426.16
4. Step 4: Simplify right side
   105,700.10x = 14,495,632,464.00
5. Step 5: Solve for x
   x = 14,495,632,464.00/105,700.10
6. Step 6: Final answer
   x = 137,139.25