Finding the Fourth Proportional to 9,900.26, 13,662.40 and 5,424.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.26 : 13,662.40 = 5,424.30 : x
2. Step 2: Convert to fraction form
   9,900.26/13,662.40 = 5,424.30/x
3. Step 3: Cross multiply
   9,900.26x = 13,662.40 × 5,424.30
4. Step 4: Simplify right side
   9,900.26x = 74,108,956.32
5. Step 5: Solve for x
   x = 74,108,956.32/9,900.26
6. Step 6: Final answer
   x = 7,485.56