Finding the Fourth Proportional to 105,423.98, 145,434.84 and 65,123.24

Step by Step Solution

1. Step 1: Write the proportion equation
   105,423.98 : 145,434.84 = 65,123.24 : x
2. Step 2: Convert to fraction form
   105,423.98/145,434.84 = 65,123.24/x
3. Step 3: Cross multiply
   105,423.98x = 145,434.84 × 65,123.24
4. Step 4: Simplify right side
   105,423.98x = 9,471,187,989.68
5. Step 5: Solve for x
   x = 9,471,187,989.68/105,423.98
6. Step 6: Final answer
   x = 89,839.03