Finding the Third Proportional to 31,080 and 67,344

Step by Step Solution

1. Step 1: Write the proportion equation
   31,080 : 67,344 = 67,344 : x
2. Step 2: Convert to fraction form
   31,080/67,344 = 67,344/x
3. Step 3: Cross multiply
   31,080x = 67,344 × 67,344
4. Step 4: Simplify right side
   31,080x = 4,535,214,336
5. Step 5: Solve for x
   x = 4,535,214,336/31,080
6. Step 6: Final answer
   x = 145,920.67