Finding the Fourth Proportional to 9,899.61, 13,661.46 and 5,423.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.61 : 13,661.46 = 5,423.38 : x
2. Step 2: Convert to fraction form
   9,899.61/13,661.46 = 5,423.38/x
3. Step 3: Cross multiply
   9,899.61x = 13,661.46 × 5,423.38
4. Step 4: Simplify right side
   9,899.61x = 74,091,288.93
5. Step 5: Solve for x
   x = 74,091,288.93/9,899.61
6. Step 6: Final answer
   x = 7,484.26