Finding the Fourth Proportional to 10,139.38, 13,991.67 and 7,750.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.38 : 13,991.67 = 7,750.96 : x
2. Step 2: Convert to fraction form
   10,139.38/13,991.67 = 7,750.96/x
3. Step 3: Cross multiply
   10,139.38x = 13,991.67 × 7,750.96
4. Step 4: Simplify right side
   10,139.38x = 108,448,839.52
5. Step 5: Solve for x
   x = 108,448,839.52/10,139.38
6. Step 6: Final answer
   x = 10,695.81