Finding the Fourth Proportional to 21,016.16, 31,504.88 and 7,155.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.16 : 31,504.88 = 7,155.52 : x
2. Step 2: Convert to fraction form
   21,016.16/31,504.88 = 7,155.52/x
3. Step 3: Cross multiply
   21,016.16x = 31,504.88 × 7,155.52
4. Step 4: Simplify right side
   21,016.16x = 225,433,798.94
5. Step 5: Solve for x
   x = 225,433,798.94/21,016.16
6. Step 6: Final answer
   x = 10,726.69