Finding the Third Proportional to 83,128.50 and 128,981.25

Step by Step Solution

1. Step 1: Write the proportion equation
   83,128.50 : 128,981.25 = 128,981.25 : x
2. Step 2: Convert to fraction form
   83,128.50/128,981.25 = 128,981.25/x
3. Step 3: Cross multiply
   83,128.50x = 128,981.25 × 128,981.25
4. Step 4: Simplify right side
   83,128.50x = 16,636,162,851.56
5. Step 5: Solve for x
   x = 16,636,162,851.56/83,128.50
6. Step 6: Final answer
   x = 200,125.86