Finding the Fourth Proportional to 21,218.00, 31,778.55 and 10,132.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,218.00 : 31,778.55 = 10,132.49 : x
2. Step 2: Convert to fraction form
   21,218.00/31,778.55 = 10,132.49/x
3. Step 3: Cross multiply
   21,218.00x = 31,778.55 × 10,132.49
4. Step 4: Simplify right side
   21,218.00x = 321,995,919.54
5. Step 5: Solve for x
   x = 321,995,919.54/21,218.00
6. Step 6: Final answer
   x = 15,175.61