Finding the Third Proportional to 56,640 and 89,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,640 : 89,959.50 = 89,959.50 : x
2. Step 2: Convert to fraction form
   56,640/89,959.50 = 89,959.50/x
3. Step 3: Cross multiply
   56,640x = 89,959.50 × 89,959.50
4. Step 4: Simplify right side
   56,640x = 8,092,711,640.25
5. Step 5: Solve for x
   x = 8,092,711,640.25/56,640
6. Step 6: Final answer
   x = 142,879.80