Finding the Fourth Proportional to 10,945.45, 16,418.02 and 7,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,945.45 : 16,418.02 = 7,426.72 : x
2. Step 2: Convert to fraction form
   10,945.45/16,418.02 = 7,426.72/x
3. Step 3: Cross multiply
   10,945.45x = 16,418.02 × 7,426.72
4. Step 4: Simplify right side
   10,945.45x = 121,932,037.49
5. Step 5: Solve for x
   x = 121,932,037.49/10,945.45
6. Step 6: Final answer
   x = 11,139.97