Finding the Fourth Proportional to 9,900.65, 13,662.69 and 5,424.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.65 : 13,662.69 = 5,424.18 : x
2. Step 2: Convert to fraction form
   9,900.65/13,662.69 = 5,424.18/x
3. Step 3: Cross multiply
   9,900.65x = 13,662.69 × 5,424.18
4. Step 4: Simplify right side
   9,900.65x = 74,108,889.84
5. Step 5: Solve for x
   x = 74,108,889.84/9,900.65
6. Step 6: Final answer
   x = 7,485.26