Finding the Third Proportional to 39,690 and 56,416.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,690 : 56,416.50 = 56,416.50 : x
2. Step 2: Convert to fraction form
   39,690/56,416.50 = 56,416.50/x
3. Step 3: Cross multiply
   39,690x = 56,416.50 × 56,416.50
4. Step 4: Simplify right side
   39,690x = 3,182,821,472.25
5. Step 5: Solve for x
   x = 3,182,821,472.25/39,690
6. Step 6: Final answer
   x = 80,192.03