Finding the Fourth Proportional to 10,139.72, 13,992.88 and 5,663.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.72 : 13,992.88 = 5,663.87 : x
2. Step 2: Convert to fraction form
   10,139.72/13,992.88 = 5,663.87/x
3. Step 3: Cross multiply
   10,139.72x = 13,992.88 × 5,663.87
4. Step 4: Simplify right side
   10,139.72x = 79,253,853.25
5. Step 5: Solve for x
   x = 79,253,853.25/10,139.72
6. Step 6: Final answer
   x = 7,816.18