Finding the Third Proportional to 82,820.25 and 128,479.50

Step by Step Solution

1. Step 1: Write the proportion equation
   82,820.25 : 128,479.50 = 128,479.50 : x
2. Step 2: Convert to fraction form
   82,820.25/128,479.50 = 128,479.50/x
3. Step 3: Cross multiply
   82,820.25x = 128,479.50 × 128,479.50
4. Step 4: Simplify right side
   82,820.25x = 16,506,981,920.25
5. Step 5: Solve for x
   x = 16,506,981,920.25/82,820.25
6. Step 6: Final answer
   x = 199,310.94