Finding the Fourth Proportional to 9,054.32, 12,498.80 and 5,518.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,054.32 : 12,498.80 = 5,518.80 : x
2. Step 2: Convert to fraction form
   9,054.32/12,498.80 = 5,518.80/x
3. Step 3: Cross multiply
   9,054.32x = 12,498.80 × 5,518.80
4. Step 4: Simplify right side
   9,054.32x = 68,978,377.44
5. Step 5: Solve for x
   x = 68,978,377.44/9,054.32
6. Step 6: Final answer
   x = 7,618.28