Finding the Fourth Proportional to 9,900.18, 13,662.48 and 5,423.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.18 : 13,662.48 = 5,423.91 : x
2. Step 2: Convert to fraction form
   9,900.18/13,662.48 = 5,423.91/x
3. Step 3: Cross multiply
   9,900.18x = 13,662.48 × 5,423.91
4. Step 4: Simplify right side
   9,900.18x = 74,104,061.90
5. Step 5: Solve for x
   x = 74,104,061.90/9,900.18
6. Step 6: Final answer
   x = 7,485.12