Finding the Third Proportional to 12,318 and 28,920

Step by Step Solution

1. Step 1: Write the proportion equation
   12,318 : 28,920 = 28,920 : x
2. Step 2: Convert to fraction form
   12,318/28,920 = 28,920/x
3. Step 3: Cross multiply
   12,318x = 28,920 × 28,920
4. Step 4: Simplify right side
   12,318x = 836,366,400
5. Step 5: Solve for x
   x = 836,366,400/12,318
6. Step 6: Final answer
   x = 67,897.91