Finding the Fourth Proportional to 13,578.72, 20,327.76 and 7,404

Step by Step Solution

1. Step 1: Write the proportion equation
   13,578.72 : 20,327.76 = 7,404 : x
2. Step 2: Convert to fraction form
   13,578.72/20,327.76 = 7,404/x
3. Step 3: Cross multiply
   13,578.72x = 20,327.76 × 7,404
4. Step 4: Simplify right side
   13,578.72x = 150,506,735.04
5. Step 5: Solve for x
   x = 150,506,735.04/13,578.72
6. Step 6: Final answer
   x = 11,084.01