Finding the Fourth Proportional to 10,139.43, 13,991.03 and 5,662.61

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.43 : 13,991.03 = 5,662.61 : x
2. Step 2: Convert to fraction form
   10,139.43/13,991.03 = 5,662.61/x
3. Step 3: Cross multiply
   10,139.43x = 13,991.03 × 5,662.61
4. Step 4: Simplify right side
   10,139.43x = 79,225,721.82
5. Step 5: Solve for x
   x = 79,225,721.82/10,139.43
6. Step 6: Final answer
   x = 7,813.63