Finding the Fourth Proportional to 105,665.29, 145,833.05 and 65,392.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,665.29 : 145,833.05 = 65,392.04 : x
2. Step 2: Convert to fraction form
   105,665.29/145,833.05 = 65,392.04/x
3. Step 3: Cross multiply
   105,665.29x = 145,833.05 × 65,392.04
4. Step 4: Simplify right side
   105,665.29x = 9,536,321,166.98
5. Step 5: Solve for x
   x = 9,536,321,166.98/105,665.29
6. Step 6: Final answer
   x = 90,250.27