Finding the Fourth Proportional to 11,691.96, 16,139.46 and 7,913.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,691.96 : 16,139.46 = 7,913.28 : x
2. Step 2: Convert to fraction form
   11,691.96/16,139.46 = 7,913.28/x
3. Step 3: Cross multiply
   11,691.96x = 16,139.46 × 7,913.28
4. Step 4: Simplify right side
   11,691.96x = 127,716,066.03
5. Step 5: Solve for x
   x = 127,716,066.03/11,691.96
6. Step 6: Final answer
   x = 10,923.41