Finding the Fourth Proportional to 9,618.84, 13,272.42 and 5,426.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,618.84 : 13,272.42 = 5,426.28 : x
2. Step 2: Convert to fraction form
   9,618.84/13,272.42 = 5,426.28/x
3. Step 3: Cross multiply
   9,618.84x = 13,272.42 × 5,426.28
4. Step 4: Simplify right side
   9,618.84x = 72,019,867.20
5. Step 5: Solve for x
   x = 72,019,867.20/9,618.84
6. Step 6: Final answer
   x = 7,487.38