Finding the Fourth Proportional to 105,872.10, 146,103.74 and 58,128.53

Step by Step Solution

1. Step 1: Write the proportion equation
   105,872.10 : 146,103.74 = 58,128.53 : x
2. Step 2: Convert to fraction form
   105,872.10/146,103.74 = 58,128.53/x
3. Step 3: Cross multiply
   105,872.10x = 146,103.74 × 58,128.53
4. Step 4: Simplify right side
   105,872.10x = 8,492,794,612.54
5. Step 5: Solve for x
   x = 8,492,794,612.54/105,872.10
6. Step 6: Final answer
   x = 80,217.49