Finding the Third Proportional to 21,758.20 and 29,356.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,758.20 : 29,356.80 = 29,356.80 : x
2. Step 2: Convert to fraction form
   21,758.20/29,356.80 = 29,356.80/x
3. Step 3: Cross multiply
   21,758.20x = 29,356.80 × 29,356.80
4. Step 4: Simplify right side
   21,758.20x = 861,821,981.46
5. Step 5: Solve for x
   x = 861,821,981.46/21,758.20
6. Step 6: Final answer
   x = 39,609.06