Finding the Fourth Proportional to 9,899.35, 13,661.10 and 5,423.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.35 : 13,661.10 = 5,423.38 : x
2. Step 2: Convert to fraction form
   9,899.35/13,661.10 = 5,423.38/x
3. Step 3: Cross multiply
   9,899.35x = 13,661.10 × 5,423.38
4. Step 4: Simplify right side
   9,899.35x = 74,089,336.52
5. Step 5: Solve for x
   x = 74,089,336.52/9,899.35
6. Step 6: Final answer
   x = 7,484.26