Finding the Third Proportional to 31,260 and 67,408

Step by Step Solution

1. Step 1: Write the proportion equation
   31,260 : 67,408 = 67,408 : x
2. Step 2: Convert to fraction form
   31,260/67,408 = 67,408/x
3. Step 3: Cross multiply
   31,260x = 67,408 × 67,408
4. Step 4: Simplify right side
   31,260x = 4,543,838,464
5. Step 5: Solve for x
   x = 4,543,838,464/31,260
6. Step 6: Final answer
   x = 145,356.32