Finding the Third Proportional to 21,643 and 28,900

Step by Step Solution

1. Step 1: Write the proportion equation
   21,643 : 28,900 = 28,900 : x
2. Step 2: Convert to fraction form
   21,643/28,900 = 28,900/x
3. Step 3: Cross multiply
   21,643x = 28,900 × 28,900
4. Step 4: Simplify right side
   21,643x = 835,210,000
5. Step 5: Solve for x
   x = 835,210,000/21,643
6. Step 6: Final answer
   x = 38,590.31