Finding the Fourth Proportional to 8,781.38, 12,118.50 and 5,426.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,781.38 : 12,118.50 = 5,426.49 : x
2. Step 2: Convert to fraction form
   8,781.38/12,118.50 = 5,426.49/x
3. Step 3: Cross multiply
   8,781.38x = 12,118.50 × 5,426.49
4. Step 4: Simplify right side
   8,781.38x = 65,760,919.07
5. Step 5: Solve for x
   x = 65,760,919.07/8,781.38
6. Step 6: Final answer
   x = 7,488.68