Finding the Fourth Proportional to 105,890.80, 146,128.86 and 58,142.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105,890.80 : 146,128.86 = 58,142.92 : x
2. Step 2: Convert to fraction form
   105,890.80/146,128.86 = 58,142.92/x
3. Step 3: Cross multiply
   105,890.80x = 146,128.86 × 58,142.92
4. Step 4: Simplify right side
   105,890.80x = 8,496,358,616.67
5. Step 5: Solve for x
   x = 8,496,358,616.67/105,890.80
6. Step 6: Final answer
   x = 80,236.99