Finding the Fourth Proportional to 1,674.38, 2,311.80 and 1,280.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,674.38 : 2,311.80 = 1,280.72 : x
2. Step 2: Convert to fraction form
   1,674.38/2,311.80 = 1,280.72/x
3. Step 3: Cross multiply
   1,674.38x = 2,311.80 × 1,280.72
4. Step 4: Simplify right side
   1,674.38x = 2,960,768.50
5. Step 5: Solve for x
   x = 2,960,768.50/1,674.38
6. Step 6: Final answer
   x = 1,768.28