Finding the Third Proportional to 21,456 and 28,280

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456 : 28,280 = 28,280 : x
2. Step 2: Convert to fraction form
   21,456/28,280 = 28,280/x
3. Step 3: Cross multiply
   21,456x = 28,280 × 28,280
4. Step 4: Simplify right side
   21,456x = 799,758,400
5. Step 5: Solve for x
   x = 799,758,400/21,456
6. Step 6: Final answer
   x = 37,274.35