Finding the Fourth Proportional to 103,640.50, 143,023.89 and 58,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,640.50 : 143,023.89 = 58,928.50 : x
2. Step 2: Convert to fraction form
   103,640.50/143,023.89 = 58,928.50/x
3. Step 3: Cross multiply
   103,640.50x = 143,023.89 × 58,928.50
4. Step 4: Simplify right side
   103,640.50x = 8,428,183,301.87
5. Step 5: Solve for x
   x = 8,428,183,301.87/103,640.50
6. Step 6: Final answer
   x = 81,321.33