Finding the Fourth Proportional to 105,747.20, 145,917.60 and 60,428.06

Step by Step Solution

1. Step 1: Write the proportion equation
   105,747.20 : 145,917.60 = 60,428.06 : x
2. Step 2: Convert to fraction form
   105,747.20/145,917.60 = 60,428.06/x
3. Step 3: Cross multiply
   105,747.20x = 145,917.60 × 60,428.06
4. Step 4: Simplify right side
   105,747.20x = 8,817,517,487.86
5. Step 5: Solve for x
   x = 8,817,517,487.86/105,747.20
6. Step 6: Final answer
   x = 83,382.99