Finding the Fourth Proportional to 22,987.10, 31,721 and 12,915.98

Step by Step Solution

1. Step 1: Write the proportion equation
   22,987.10 : 31,721 = 12,915.98 : x
2. Step 2: Convert to fraction form
   22,987.10/31,721 = 12,915.98/x
3. Step 3: Cross multiply
   22,987.10x = 31,721 × 12,915.98
4. Step 4: Simplify right side
   22,987.10x = 409,707,801.58
5. Step 5: Solve for x
   x = 409,707,801.58/22,987.10
6. Step 6: Final answer
   x = 17,823.38