Finding the Fourth Proportional to 10,057.72, 13,879.55 and 5,581.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,057.72 : 13,879.55 = 5,581.36 : x
2. Step 2: Convert to fraction form
   10,057.72/13,879.55 = 5,581.36/x
3. Step 3: Cross multiply
   10,057.72x = 13,879.55 × 5,581.36
4. Step 4: Simplify right side
   10,057.72x = 77,466,718.42
5. Step 5: Solve for x
   x = 77,466,718.42/10,057.72
6. Step 6: Final answer
   x = 7,702.22