Finding the Fourth Proportional to 11,638.78, 16,069.55 and 10,895.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,638.78 : 16,069.55 = 10,895.20 : x
2. Step 2: Convert to fraction form
   11,638.78/16,069.55 = 10,895.20/x
3. Step 3: Cross multiply
   11,638.78x = 16,069.55 × 10,895.20
4. Step 4: Simplify right side
   11,638.78x = 175,080,826.34
5. Step 5: Solve for x
   x = 175,080,826.34/11,638.78
6. Step 6: Final answer
   x = 15,042.89