Finding the Fourth Proportional to 21,658.32, 32,487.42 and 17,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,658.32 : 32,487.42 = 17,721.72 : x
2. Step 2: Convert to fraction form
   21,658.32/32,487.42 = 17,721.72/x
3. Step 3: Cross multiply
   21,658.32x = 32,487.42 × 17,721.72
4. Step 4: Simplify right side
   21,658.32x = 575,732,960.76
5. Step 5: Solve for x
   x = 575,732,960.76/21,658.32
6. Step 6: Final answer
   x = 26,582.53