Finding the Fourth Proportional to 9,666.37, 13,340.52 and 5,418.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,666.37 : 13,340.52 = 5,418.15 : x
2. Step 2: Convert to fraction form
   9,666.37/13,340.52 = 5,418.15/x
3. Step 3: Cross multiply
   9,666.37x = 13,340.52 × 5,418.15
4. Step 4: Simplify right side
   9,666.37x = 72,280,938.44
5. Step 5: Solve for x
   x = 72,280,938.44/9,666.37
6. Step 6: Final answer
   x = 7,477.57