Finding the Fourth Proportional to 15,862.10, 21,839.83 and 12,887.78

Step by Step Solution

1. Step 1: Write the proportion equation
   15,862.10 : 21,839.83 = 12,887.78 : x
2. Step 2: Convert to fraction form
   15,862.10/21,839.83 = 12,887.78/x
3. Step 3: Cross multiply
   15,862.10x = 21,839.83 × 12,887.78
4. Step 4: Simplify right side
   15,862.10x = 281,466,782.86
5. Step 5: Solve for x
   x = 281,466,782.86/15,862.10
6. Step 6: Final answer
   x = 17,744.62