Finding the Fourth Proportional to 105,141.18, 145,146.88 and 64,877.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,141.18 : 145,146.88 = 64,877.12 : x
2. Step 2: Convert to fraction form
   105,141.18/145,146.88 = 64,877.12/x
3. Step 3: Cross multiply
   105,141.18x = 145,146.88 × 64,877.12
4. Step 4: Simplify right side
   105,141.18x = 9,416,711,551.39
5. Step 5: Solve for x
   x = 9,416,711,551.39/105,141.18
6. Step 6: Final answer
   x = 89,562.54