Finding the Fourth Proportional to 9,900.28, 13,662.54 and 5,424.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.28 : 13,662.54 = 5,424.02 : x
2. Step 2: Convert to fraction form
   9,900.28/13,662.54 = 5,424.02/x
3. Step 3: Cross multiply
   9,900.28x = 13,662.54 × 5,424.02
4. Step 4: Simplify right side
   9,900.28x = 74,105,890.21
5. Step 5: Solve for x
   x = 74,105,890.21/9,900.28
6. Step 6: Final answer
   x = 7,485.23