Finding the Fourth Proportional to 21,342.72, 31,987.85 and 15,104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,342.72 : 31,987.85 = 15,104.50 : x
2. Step 2: Convert to fraction form
   21,342.72/31,987.85 = 15,104.50/x
3. Step 3: Cross multiply
   21,342.72x = 31,987.85 × 15,104.50
4. Step 4: Simplify right side
   21,342.72x = 483,160,480.33
5. Step 5: Solve for x
   x = 483,160,480.33/21,342.72
6. Step 6: Final answer
   x = 22,638.19