Finding the Fourth Proportional to 9,900.35, 13,662.53 and 5,424.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.35 : 13,662.53 = 5,424.14 : x
2. Step 2: Convert to fraction form
   9,900.35/13,662.53 = 5,424.14/x
3. Step 3: Cross multiply
   9,900.35x = 13,662.53 × 5,424.14
4. Step 4: Simplify right side
   9,900.35x = 74,107,448.35
5. Step 5: Solve for x
   x = 74,107,448.35/9,900.35
6. Step 6: Final answer
   x = 7,485.34