Finding the Third Proportional to 31,280 and 67,450

Step by Step Solution

1. Step 1: Write the proportion equation
   31,280 : 67,450 = 67,450 : x
2. Step 2: Convert to fraction form
   31,280/67,450 = 67,450/x
3. Step 3: Cross multiply
   31,280x = 67,450 × 67,450
4. Step 4: Simplify right side
   31,280x = 4,549,502,500
5. Step 5: Solve for x
   x = 4,549,502,500/31,280
6. Step 6: Final answer
   x = 145,444.45