Finding the Fourth Proportional to 105,815.63, 146,029.79 and 58,070.69

Step by Step Solution

1. Step 1: Write the proportion equation
   105,815.63 : 146,029.79 = 58,070.69 : x
2. Step 2: Convert to fraction form
   105,815.63/146,029.79 = 58,070.69/x
3. Step 3: Cross multiply
   105,815.63x = 146,029.79 × 58,070.69
4. Step 4: Simplify right side
   105,815.63x = 8,480,050,665.86
5. Step 5: Solve for x
   x = 8,480,050,665.86/105,815.63
6. Step 6: Final answer
   x = 80,139.87