Finding the Fourth Proportional to 11,945.31, 16,491.90 and 7,697.87

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.31 : 16,491.90 = 7,697.87 : x
2. Step 2: Convert to fraction form
   11,945.31/16,491.90 = 7,697.87/x
3. Step 3: Cross multiply
   11,945.31x = 16,491.90 × 7,697.87
4. Step 4: Simplify right side
   11,945.31x = 126,952,502.25
5. Step 5: Solve for x
   x = 126,952,502.25/11,945.31
6. Step 6: Final answer
   x = 10,627.81