Finding the Fourth Proportional to 9,900.10, 13,662.10 and 5,424.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.10 : 13,662.10 = 5,424.13 : x
2. Step 2: Convert to fraction form
   9,900.10/13,662.10 = 5,424.13/x
3. Step 3: Cross multiply
   9,900.10x = 13,662.10 × 5,424.13
4. Step 4: Simplify right side
   9,900.10x = 74,105,006.47
5. Step 5: Solve for x
   x = 74,105,006.47/9,900.10
6. Step 6: Final answer
   x = 7,485.28