Finding the Fourth Proportional to 100,895.57, 139,235.88 and 58,478.71

Step by Step Solution

1. Step 1: Write the proportion equation
   100,895.57 : 139,235.88 = 58,478.71 : x
2. Step 2: Convert to fraction form
   100,895.57/139,235.88 = 58,478.71/x
3. Step 3: Cross multiply
   100,895.57x = 139,235.88 × 58,478.71
4. Step 4: Simplify right side
   100,895.57x = 8,142,334,648.11
5. Step 5: Solve for x
   x = 8,142,334,648.11/100,895.57
6. Step 6: Final answer
   x = 80,700.62