Finding the Fourth Proportional to 10,139.20, 13,992.18 and 5,662.92

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.20 : 13,992.18 = 5,662.92 : x
2. Step 2: Convert to fraction form
   10,139.20/13,992.18 = 5,662.92/x
3. Step 3: Cross multiply
   10,139.20x = 13,992.18 × 5,662.92
4. Step 4: Simplify right side
   10,139.20x = 79,236,595.97
5. Step 5: Solve for x
   x = 79,236,595.97/10,139.20
6. Step 6: Final answer
   x = 7,814.88