Finding the Third Proportional to 85,707 and 128,479.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,707 : 128,479.50 = 128,479.50 : x
2. Step 2: Convert to fraction form
   85,707/128,479.50 = 128,479.50/x
3. Step 3: Cross multiply
   85,707x = 128,479.50 × 128,479.50
4. Step 4: Simplify right side
   85,707x = 16,506,981,920.25
5. Step 5: Solve for x
   x = 16,506,981,920.25/85,707
6. Step 6: Final answer
   x = 192,597.83