Finding the Fourth Proportional to 2,280.50, 3,420.45 and 892.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.50 : 3,420.45 = 892.88 : x
2. Step 2: Convert to fraction form
   2,280.50/3,420.45 = 892.88/x
3. Step 3: Cross multiply
   2,280.50x = 3,420.45 × 892.88
4. Step 4: Simplify right side
   2,280.50x = 3,054,034.29
5. Step 5: Solve for x
   x = 3,054,034.29/2,280.50
6. Step 6: Final answer
   x = 1,339.20