Finding the Fourth Proportional to 10,874.10, 15,021.78 and 10,086.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,874.10 : 15,021.78 = 10,086.78 : x
2. Step 2: Convert to fraction form
   10,874.10/15,021.78 = 10,086.78/x
3. Step 3: Cross multiply
   10,874.10x = 15,021.78 × 10,086.78
4. Step 4: Simplify right side
   10,874.10x = 151,521,390.07
5. Step 5: Solve for x
   x = 151,521,390.07/10,874.10
6. Step 6: Final answer
   x = 13,934.15