Finding the Third Proportional to 31,316 and 67,080

Step by Step Solution

1. Step 1: Write the proportion equation
   31,316 : 67,080 = 67,080 : x
2. Step 2: Convert to fraction form
   31,316/67,080 = 67,080/x
3. Step 3: Cross multiply
   31,316x = 67,080 × 67,080
4. Step 4: Simplify right side
   31,316x = 4,499,726,400
5. Step 5: Solve for x
   x = 4,499,726,400/31,316
6. Step 6: Final answer
   x = 143,687.78