Finding the Third Proportional to 62,721 and 89,409

Step by Step Solution

1. Step 1: Write the proportion equation
   62,721 : 89,409 = 89,409 : x
2. Step 2: Convert to fraction form
   62,721/89,409 = 89,409/x
3. Step 3: Cross multiply
   62,721x = 89,409 × 89,409
4. Step 4: Simplify right side
   62,721x = 7,993,969,281
5. Step 5: Solve for x
   x = 7,993,969,281/62,721
6. Step 6: Final answer
   x = 127,452.84