Finding the Fourth Proportional to 10,057.79, 13,879.81 and 5,581.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,057.79 : 13,879.81 = 5,581.63 : x
2. Step 2: Convert to fraction form
   10,057.79/13,879.81 = 5,581.63/x
3. Step 3: Cross multiply
   10,057.79x = 13,879.81 × 5,581.63
4. Step 4: Simplify right side
   10,057.79x = 77,471,963.89
5. Step 5: Solve for x
   x = 77,471,963.89/10,057.79
6. Step 6: Final answer
   x = 7,702.68