Finding the Fourth Proportional to 105,217.50, 145,204.47 and 60,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,217.50 : 145,204.47 = 60,505.50 : x
2. Step 2: Convert to fraction form
   105,217.50/145,204.47 = 60,505.50/x
3. Step 3: Cross multiply
   105,217.50x = 145,204.47 × 60,505.50
4. Step 4: Simplify right side
   105,217.50x = 8,785,669,059.59
5. Step 5: Solve for x
   x = 8,785,669,059.59/105,217.50
6. Step 6: Final answer
   x = 83,500.07