Finding the Fourth Proportional to 23,061.28, 31,824.76 and 12,987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   23,061.28 : 31,824.76 = 12,987.72 : x
2. Step 2: Convert to fraction form
   23,061.28/31,824.76 = 12,987.72/x
3. Step 3: Cross multiply
   23,061.28x = 31,824.76 × 12,987.72
4. Step 4: Simplify right side
   23,061.28x = 413,331,071.95
5. Step 5: Solve for x
   x = 413,331,071.95/23,061.28
6. Step 6: Final answer
   x = 17,923.16