Finding the Fourth Proportional to 9,618.04, 13,272.78 and 5,426.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,618.04 : 13,272.78 = 5,426.20 : x
2. Step 2: Convert to fraction form
   9,618.04/13,272.78 = 5,426.20/x
3. Step 3: Cross multiply
   9,618.04x = 13,272.78 × 5,426.20
4. Step 4: Simplify right side
   9,618.04x = 72,020,758.84
5. Step 5: Solve for x
   x = 72,020,758.84/9,618.04
6. Step 6: Final answer
   x = 7,488.09