Finding the Fourth Proportional to 9,900.21, 13,662.54 and 5,423.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.21 : 13,662.54 = 5,423.98 : x
2. Step 2: Convert to fraction form
   9,900.21/13,662.54 = 5,423.98/x
3. Step 3: Cross multiply
   9,900.21x = 13,662.54 × 5,423.98
4. Step 4: Simplify right side
   9,900.21x = 74,105,343.71
5. Step 5: Solve for x
   x = 74,105,343.71/9,900.21
6. Step 6: Final answer
   x = 7,485.23