Finding the Fourth Proportional to 9,900.18, 13,661.91 and 5,919.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.18 : 13,661.91 = 5,919.23 : x
2. Step 2: Convert to fraction form
   9,900.18/13,661.91 = 5,919.23/x
3. Step 3: Cross multiply
   9,900.18x = 13,661.91 × 5,919.23
4. Step 4: Simplify right side
   9,900.18x = 80,867,919.22
5. Step 5: Solve for x
   x = 80,867,919.22/9,900.18
6. Step 6: Final answer
   x = 8,168.33