Finding the Fourth Proportional to 9,900.83, 13,662.84 and 5,424.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.83 : 13,662.84 = 5,424.55 : x
2. Step 2: Convert to fraction form
   9,900.83/13,662.84 = 5,424.55/x
3. Step 3: Cross multiply
   9,900.83x = 13,662.84 × 5,424.55
4. Step 4: Simplify right side
   9,900.83x = 74,114,724.56
5. Step 5: Solve for x
   x = 74,114,724.56/9,900.83
6. Step 6: Final answer
   x = 7,485.71