Finding the Third Proportional to 57,488.50 and 85,879.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,488.50 : 85,879.75 = 85,879.75 : x
2. Step 2: Convert to fraction form
   57,488.50/85,879.75 = 85,879.75/x
3. Step 3: Cross multiply
   57,488.50x = 85,879.75 × 85,879.75
4. Step 4: Simplify right side
   57,488.50x = 7,375,331,460.06
5. Step 5: Solve for x
   x = 7,375,331,460.06/57,488.50
6. Step 6: Final answer
   x = 128,292.29