Finding the Fourth Proportional to 9,899.82, 13,661.72 and 5,423.84

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.82 : 13,661.72 = 5,423.84 : x
2. Step 2: Convert to fraction form
   9,899.82/13,661.72 = 5,423.84/x
3. Step 3: Cross multiply
   9,899.82x = 13,661.72 × 5,423.84
4. Step 4: Simplify right side
   9,899.82x = 74,098,983.40
5. Step 5: Solve for x
   x = 74,098,983.40/9,899.82
6. Step 6: Final answer
   x = 7,484.88