Finding the Fourth Proportional to 103,728.50, 143,109.88 and 62,905.10

Step by Step Solution

1. Step 1: Write the proportion equation
   103,728.50 : 143,109.88 = 62,905.10 : x
2. Step 2: Convert to fraction form
   103,728.50/143,109.88 = 62,905.10/x
3. Step 3: Cross multiply
   103,728.50x = 143,109.88 × 62,905.10
4. Step 4: Simplify right side
   103,728.50x = 9,002,341,312.39
5. Step 5: Solve for x
   x = 9,002,341,312.39/103,728.50
6. Step 6: Final answer
   x = 86,787.54