Finding the Fourth Proportional to 9,899.30, 13,661.12 and 5,423.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.30 : 13,661.12 = 5,423.48 : x
2. Step 2: Convert to fraction form
   9,899.30/13,661.12 = 5,423.48/x
3. Step 3: Cross multiply
   9,899.30x = 13,661.12 × 5,423.48
4. Step 4: Simplify right side
   9,899.30x = 74,090,715.67
5. Step 5: Solve for x
   x = 74,090,715.67/9,899.30
6. Step 6: Final answer
   x = 7,484.44