Finding the Fourth Proportional to 22,986.72, 31,724.88 and 12,915.95

Step by Step Solution

1. Step 1: Write the proportion equation
   22,986.72 : 31,724.88 = 12,915.95 : x
2. Step 2: Convert to fraction form
   22,986.72/31,724.88 = 12,915.95/x
3. Step 3: Cross multiply
   22,986.72x = 31,724.88 × 12,915.95
4. Step 4: Simplify right side
   22,986.72x = 409,756,805.21
5. Step 5: Solve for x
   x = 409,756,805.21/22,986.72
6. Step 6: Final answer
   x = 17,825.81