Finding the Third Proportional to 3,970.50 and 8,487.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,970.50 : 8,487.56 = 8,487.56 : x
2. Step 2: Convert to fraction form
   3,970.50/8,487.56 = 8,487.56/x
3. Step 3: Cross multiply
   3,970.50x = 8,487.56 × 8,487.56
4. Step 4: Simplify right side
   3,970.50x = 72,038,717.19
5. Step 5: Solve for x
   x = 72,038,717.19/3,970.50
6. Step 6: Final answer
   x = 18,143.49