Finding the Fourth Proportional to 11,913.56, 16,438.50 and 7,719.38

Step by Step Solution

1. Step 1: Write the proportion equation
   11,913.56 : 16,438.50 = 7,719.38 : x
2. Step 2: Convert to fraction form
   11,913.56/16,438.50 = 7,719.38/x
3. Step 3: Cross multiply
   11,913.56x = 16,438.50 × 7,719.38
4. Step 4: Simplify right side
   11,913.56x = 126,894,945.94
5. Step 5: Solve for x
   x = 126,894,945.94/11,913.56
6. Step 6: Final answer
   x = 10,651.31