Finding the Third Proportional to 12,912 and 28,320

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912 : 28,320 = 28,320 : x
2. Step 2: Convert to fraction form
   12,912/28,320 = 28,320/x
3. Step 3: Cross multiply
   12,912x = 28,320 × 28,320
4. Step 4: Simplify right side
   12,912x = 802,022,400
5. Step 5: Solve for x
   x = 802,022,400/12,912
6. Step 6: Final answer
   x = 62,114.50