Finding the Third Proportional to 31,260 and 67,860

Step by Step Solution

1. Step 1: Write the proportion equation
   31,260 : 67,860 = 67,860 : x
2. Step 2: Convert to fraction form
   31,260/67,860 = 67,860/x
3. Step 3: Cross multiply
   31,260x = 67,860 × 67,860
4. Step 4: Simplify right side
   31,260x = 4,604,979,600
5. Step 5: Solve for x
   x = 4,604,979,600/31,260
6. Step 6: Final answer
   x = 147,312.21