Finding the Fourth Proportional to 9,899.50, 13,661.33 and 5,423.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.50 : 13,661.33 = 5,423.34 : x
2. Step 2: Convert to fraction form
   9,899.50/13,661.33 = 5,423.34/x
3. Step 3: Cross multiply
   9,899.50x = 13,661.33 × 5,423.34
4. Step 4: Simplify right side
   9,899.50x = 74,090,035.55
5. Step 5: Solve for x
   x = 74,090,035.55/9,899.50
6. Step 6: Final answer
   x = 7,484.22