Finding the Fourth Proportional to 9,899.79, 13,662.09 and 5,423.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.79 : 13,662.09 = 5,423.73 : x
2. Step 2: Convert to fraction form
   9,899.79/13,662.09 = 5,423.73/x
3. Step 3: Cross multiply
   9,899.79x = 13,662.09 × 5,423.73
4. Step 4: Simplify right side
   9,899.79x = 74,099,487.40
5. Step 5: Solve for x
   x = 74,099,487.40/9,899.79
6. Step 6: Final answer
   x = 7,484.96