Finding the Third Proportional to 21,200 and 28,776

Step by Step Solution

1. Step 1: Write the proportion equation
   21,200 : 28,776 = 28,776 : x
2. Step 2: Convert to fraction form
   21,200/28,776 = 28,776/x
3. Step 3: Cross multiply
   21,200x = 28,776 × 28,776
4. Step 4: Simplify right side
   21,200x = 828,058,176
5. Step 5: Solve for x
   x = 828,058,176/21,200
6. Step 6: Final answer
   x = 39,059.35