Finding the Third Proportional to 14,280 and 30,990

Step by Step Solution

1. Step 1: Write the proportion equation
   14,280 : 30,990 = 30,990 : x
2. Step 2: Convert to fraction form
   14,280/30,990 = 30,990/x
3. Step 3: Cross multiply
   14,280x = 30,990 × 30,990
4. Step 4: Simplify right side
   14,280x = 960,380,100
5. Step 5: Solve for x
   x = 960,380,100/14,280
6. Step 6: Final answer
   x = 67,253.51