Finding the Fourth Proportional to 11,511.70, 15,864.43 and 10,086.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,511.70 : 15,864.43 = 10,086.10 : x
2. Step 2: Convert to fraction form
   11,511.70/15,864.43 = 10,086.10/x
3. Step 3: Cross multiply
   11,511.70x = 15,864.43 × 10,086.10
4. Step 4: Simplify right side
   11,511.70x = 160,010,162.55
5. Step 5: Solve for x
   x = 160,010,162.55/11,511.70
6. Step 6: Final answer
   x = 13,899.79