Finding the Fourth Proportional to 9,966.94, 13,753.85 and 5,490.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,966.94 : 13,753.85 = 5,490.59 : x
2. Step 2: Convert to fraction form
   9,966.94/13,753.85 = 5,490.59/x
3. Step 3: Cross multiply
   9,966.94x = 13,753.85 × 5,490.59
4. Step 4: Simplify right side
   9,966.94x = 75,516,685.93
5. Step 5: Solve for x
   x = 75,516,685.93/9,966.94
6. Step 6: Final answer
   x = 7,576.72