Finding the Third Proportional to 5,280.19 and 8,242.88

Step by Step Solution

1. Step 1: Write the proportion equation
   5,280.19 : 8,242.88 = 8,242.88 : x
2. Step 2: Convert to fraction form
   5,280.19/8,242.88 = 8,242.88/x
3. Step 3: Cross multiply
   5,280.19x = 8,242.88 × 8,242.88
4. Step 4: Simplify right side
   5,280.19x = 67,944,988.27
5. Step 5: Solve for x
   x = 67,944,988.27/5,280.19
6. Step 6: Final answer
   x = 12,867.91