Finding the Third Proportional to 62,116.50 and 128,790

Step by Step Solution

1. Step 1: Write the proportion equation
   62,116.50 : 128,790 = 128,790 : x
2. Step 2: Convert to fraction form
   62,116.50/128,790 = 128,790/x
3. Step 3: Cross multiply
   62,116.50x = 128,790 × 128,790
4. Step 4: Simplify right side
   62,116.50x = 16,586,864,100
5. Step 5: Solve for x
   x = 16,586,864,100/62,116.50
6. Step 6: Final answer
   x = 267,028.31