Finding the Third Proportional to 39,459 and 57,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,459 : 57,721.50 = 57,721.50 : x
2. Step 2: Convert to fraction form
   39,459/57,721.50 = 57,721.50/x
3. Step 3: Cross multiply
   39,459x = 57,721.50 × 57,721.50
4. Step 4: Simplify right side
   39,459x = 3,331,771,562.25
5. Step 5: Solve for x
   x = 3,331,771,562.25/39,459
6. Step 6: Final answer
   x = 84,436.29