Finding the Fourth Proportional to 105,120.52, 157,456.60 and 85,043.86

Step by Step Solution

1. Step 1: Write the proportion equation
   105,120.52 : 157,456.60 = 85,043.86 : x
2. Step 2: Convert to fraction form
   105,120.52/157,456.60 = 85,043.86/x
3. Step 3: Cross multiply
   105,120.52x = 157,456.60 × 85,043.86
4. Step 4: Simplify right side
   105,120.52x = 13,390,717,046.48
5. Step 5: Solve for x
   x = 13,390,717,046.48/105,120.52
6. Step 6: Final answer
   x = 127,384.43