Finding the Fourth Proportional to 105,443.92, 145,516.26 and 60,128.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105,443.92 : 145,516.26 = 60,128.74 : x
2. Step 2: Convert to fraction form
   105,443.92/145,516.26 = 60,128.74/x
3. Step 3: Cross multiply
   105,443.92x = 145,516.26 × 60,128.74
4. Step 4: Simplify right side
   105,443.92x = 8,749,709,363.31
5. Step 5: Solve for x
   x = 8,749,709,363.31/105,443.92
6. Step 6: Final answer
   x = 82,979.74