Finding the Fourth Proportional to 9,900.36, 13,662.47 and 5,424.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.36 : 13,662.47 = 5,424.10 : x
2. Step 2: Convert to fraction form
   9,900.36/13,662.47 = 5,424.10/x
3. Step 3: Cross multiply
   9,900.36x = 13,662.47 × 5,424.10
4. Step 4: Simplify right side
   9,900.36x = 74,106,582.93
5. Step 5: Solve for x
   x = 74,106,582.93/9,900.36
6. Step 6: Final answer
   x = 7,485.24