Finding the Third Proportional to 21,708 and 28,876.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,708 : 28,876.50 = 28,876.50 : x
2. Step 2: Convert to fraction form
   21,708/28,876.50 = 28,876.50/x
3. Step 3: Cross multiply
   21,708x = 28,876.50 × 28,876.50
4. Step 4: Simplify right side
   21,708x = 833,852,252.25
5. Step 5: Solve for x
   x = 833,852,252.25/21,708
6. Step 6: Final answer
   x = 38,412.21