Finding the Third Proportional to 39,717.50 and 58,239.75

Step by Step Solution

1. Step 1: Write the proportion equation
   39,717.50 : 58,239.75 = 58,239.75 : x
2. Step 2: Convert to fraction form
   39,717.50/58,239.75 = 58,239.75/x
3. Step 3: Cross multiply
   39,717.50x = 58,239.75 × 58,239.75
4. Step 4: Simplify right side
   39,717.50x = 3,391,868,480.06
5. Step 5: Solve for x
   x = 3,391,868,480.06/39,717.50
6. Step 6: Final answer
   x = 85,399.85