Finding the Third Proportional to 39,639 and 58,144.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,639 : 58,144.50 = 58,144.50 : x
2. Step 2: Convert to fraction form
   39,639/58,144.50 = 58,144.50/x
3. Step 3: Cross multiply
   39,639x = 58,144.50 × 58,144.50
4. Step 4: Simplify right side
   39,639x = 3,380,782,880.25
5. Step 5: Solve for x
   x = 3,380,782,880.25/39,639
6. Step 6: Final answer
   x = 85,289.31