Finding the Fourth Proportional to 9,618.24, 13,273.20 and 5,426.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,618.24 : 13,273.20 = 5,426.40 : x
2. Step 2: Convert to fraction form
   9,618.24/13,273.20 = 5,426.40/x
3. Step 3: Cross multiply
   9,618.24x = 13,273.20 × 5,426.40
4. Step 4: Simplify right side
   9,618.24x = 72,025,692.48
5. Step 5: Solve for x
   x = 72,025,692.48/9,618.24
6. Step 6: Final answer
   x = 7,488.45