Finding the Fourth Proportional to 11,945.59, 16,480.43 and 7,406.20

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.59 : 16,480.43 = 7,406.20 : x
2. Step 2: Convert to fraction form
   11,945.59/16,480.43 = 7,406.20/x
3. Step 3: Cross multiply
   11,945.59x = 16,480.43 × 7,406.20
4. Step 4: Simplify right side
   11,945.59x = 122,057,372.01
5. Step 5: Solve for x
   x = 122,057,372.01/11,945.59
6. Step 6: Final answer
   x = 10,217.77