Finding the Fourth Proportional to 9,766.93, 13,479.59 and 5,518.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,766.93 : 13,479.59 = 5,518.20 : x
2. Step 2: Convert to fraction form
   9,766.93/13,479.59 = 5,518.20/x
3. Step 3: Cross multiply
   9,766.93x = 13,479.59 × 5,518.20
4. Step 4: Simplify right side
   9,766.93x = 74,383,066.64
5. Step 5: Solve for x
   x = 74,383,066.64/9,766.93
6. Step 6: Final answer
   x = 7,615.81