Finding the Fourth Proportional to 9,144.98, 12,619.80 and 5,418.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.98 : 12,619.80 = 5,418.98 : x
2. Step 2: Convert to fraction form
   9,144.98/12,619.80 = 5,418.98/x
3. Step 3: Cross multiply
   9,144.98x = 12,619.80 × 5,418.98
4. Step 4: Simplify right side
   9,144.98x = 68,386,443.80
5. Step 5: Solve for x
   x = 68,386,443.80/9,144.98
6. Step 6: Final answer
   x = 7,478.03