Finding the Fourth Proportional to 21,661.32, 32,491.92 and 17,724.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,661.32 : 32,491.92 = 17,724.72 : x
2. Step 2: Convert to fraction form
   21,661.32/32,491.92 = 17,724.72/x
3. Step 3: Cross multiply
   21,661.32x = 32,491.92 × 17,724.72
4. Step 4: Simplify right side
   21,661.32x = 575,910,184.26
5. Step 5: Solve for x
   x = 575,910,184.26/21,661.32
6. Step 6: Final answer
   x = 26,587.03