Finding the Fourth Proportional to 112,854.64, 155,773.68 and 65,139.12

Step by Step Solution

1. Step 1: Write the proportion equation
   112,854.64 : 155,773.68 = 65,139.12 : x
2. Step 2: Convert to fraction form
   112,854.64/155,773.68 = 65,139.12/x
3. Step 3: Cross multiply
   112,854.64x = 155,773.68 × 65,139.12
4. Step 4: Simplify right side
   112,854.64x = 10,146,960,434.36
5. Step 5: Solve for x
   x = 10,146,960,434.36/112,854.64
6. Step 6: Final answer
   x = 89,911.77