Finding the Fourth Proportional to 8,892.80, 12,270.24 and 5,355.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,892.80 : 12,270.24 = 5,355.20 : x
2. Step 2: Convert to fraction form
   8,892.80/12,270.24 = 5,355.20/x
3. Step 3: Cross multiply
   8,892.80x = 12,270.24 × 5,355.20
4. Step 4: Simplify right side
   8,892.80x = 65,709,589.25
5. Step 5: Solve for x
   x = 65,709,589.25/8,892.80
6. Step 6: Final answer
   x = 7,389.08