Finding the Fourth Proportional to 127,128.50, 175,437.36 and 70,540.28

Step by Step Solution

1. Step 1: Write the proportion equation
   127,128.50 : 175,437.36 = 70,540.28 : x
2. Step 2: Convert to fraction form
   127,128.50/175,437.36 = 70,540.28/x
3. Step 3: Cross multiply
   127,128.50x = 175,437.36 × 70,540.28
4. Step 4: Simplify right side
   127,128.50x = 12,375,400,496.86
5. Step 5: Solve for x
   x = 12,375,400,496.86/127,128.50
6. Step 6: Final answer
   x = 97,345.60