Finding the Fourth Proportional to 9,900.56, 13,662.34 and 5,424.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.56 : 13,662.34 = 5,424.17 : x
2. Step 2: Convert to fraction form
   9,900.56/13,662.34 = 5,424.17/x
3. Step 3: Cross multiply
   9,900.56x = 13,662.34 × 5,424.17
4. Step 4: Simplify right side
   9,900.56x = 74,106,772.89
5. Step 5: Solve for x
   x = 74,106,772.89/9,900.56
6. Step 6: Final answer
   x = 7,485.11