Finding the Fourth Proportional to 9,618.20, 13,271.40 and 5,426.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,618.20 : 13,271.40 = 5,426.45 : x
2. Step 2: Convert to fraction form
   9,618.20/13,271.40 = 5,426.45/x
3. Step 3: Cross multiply
   9,618.20x = 13,271.40 × 5,426.45
4. Step 4: Simplify right side
   9,618.20x = 72,016,588.53
5. Step 5: Solve for x
   x = 72,016,588.53/9,618.20
6. Step 6: Final answer
   x = 7,487.53