Finding the Fourth Proportional to 9,894.12, 13,653.89 and 5,418.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,894.12 : 13,653.89 = 5,418.15 : x
2. Step 2: Convert to fraction form
   9,894.12/13,653.89 = 5,418.15/x
3. Step 3: Cross multiply
   9,894.12x = 13,653.89 × 5,418.15
4. Step 4: Simplify right side
   9,894.12x = 73,978,824.10
5. Step 5: Solve for x
   x = 73,978,824.10/9,894.12
6. Step 6: Final answer
   x = 7,477.05