Finding the Fourth Proportional to 23,058.28, 31,821 and 12,987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   23,058.28 : 31,821 = 12,987.10 : x
2. Step 2: Convert to fraction form
   23,058.28/31,821 = 12,987.10/x
3. Step 3: Cross multiply
   23,058.28x = 31,821 × 12,987.10
4. Step 4: Simplify right side
   23,058.28x = 413,262,509.10
5. Step 5: Solve for x
   x = 413,262,509.10/23,058.28
6. Step 6: Final answer
   x = 17,922.52