Finding the Fourth Proportional to 105,857.92, 146,074.72 and 58,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,857.92 : 146,074.72 = 58,111.20 : x
2. Step 2: Convert to fraction form
   105,857.92/146,074.72 = 58,111.20/x
3. Step 3: Cross multiply
   105,857.92x = 146,074.72 × 58,111.20
4. Step 4: Simplify right side
   105,857.92x = 8,488,577,268.86
5. Step 5: Solve for x
   x = 8,488,577,268.86/105,857.92
6. Step 6: Final answer
   x = 80,188.40