Finding the Fourth Proportional to 10,139.70, 13,991.41 and 5,662.88

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.70 : 13,991.41 = 5,662.88 : x
2. Step 2: Convert to fraction form
   10,139.70/13,991.41 = 5,662.88/x
3. Step 3: Cross multiply
   10,139.70x = 13,991.41 × 5,662.88
4. Step 4: Simplify right side
   10,139.70x = 79,231,682.52
5. Step 5: Solve for x
   x = 79,231,682.52/10,139.70
6. Step 6: Final answer
   x = 7,814.00