Finding the Fourth Proportional to 100,981.28, 139,354.72 and 58,564.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100,981.28 : 139,354.72 = 58,564.96 : x
2. Step 2: Convert to fraction form
   100,981.28/139,354.72 = 58,564.96/x
3. Step 3: Cross multiply
   100,981.28x = 139,354.72 × 58,564.96
4. Step 4: Simplify right side
   100,981.28x = 8,161,303,602.61
5. Step 5: Solve for x
   x = 8,161,303,602.61/100,981.28
6. Step 6: Final answer
   x = 80,819.97