Finding the Third Proportional to 21,120 and 28,434

Step by Step Solution

1. Step 1: Write the proportion equation
   21,120 : 28,434 = 28,434 : x
2. Step 2: Convert to fraction form
   21,120/28,434 = 28,434/x
3. Step 3: Cross multiply
   21,120x = 28,434 × 28,434
4. Step 4: Simplify right side
   21,120x = 808,492,356
5. Step 5: Solve for x
   x = 808,492,356/21,120
6. Step 6: Final answer
   x = 38,280.89