Finding the Third Proportional to 39,720 and 58,243.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,720 : 58,243.50 = 58,243.50 : x
2. Step 2: Convert to fraction form
   39,720/58,243.50 = 58,243.50/x
3. Step 3: Cross multiply
   39,720x = 58,243.50 × 58,243.50
4. Step 4: Simplify right side
   39,720x = 3,392,305,292.25
5. Step 5: Solve for x
   x = 3,392,305,292.25/39,720
6. Step 6: Final answer
   x = 85,405.47