Finding the Third Proportional to 21,408 and 28,410

Step by Step Solution

1. Step 1: Write the proportion equation
   21,408 : 28,410 = 28,410 : x
2. Step 2: Convert to fraction form
   21,408/28,410 = 28,410/x
3. Step 3: Cross multiply
   21,408x = 28,410 × 28,410
4. Step 4: Simplify right side
   21,408x = 807,128,100
5. Step 5: Solve for x
   x = 807,128,100/21,408
6. Step 6: Final answer
   x = 37,702.17