Finding the Fourth Proportional to 1,674.96, 2,311.38 and 918.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,674.96 : 2,311.38 = 918.78 : x
2. Step 2: Convert to fraction form
   1,674.96/2,311.38 = 918.78/x
3. Step 3: Cross multiply
   1,674.96x = 2,311.38 × 918.78
4. Step 4: Simplify right side
   1,674.96x = 2,123,649.72
5. Step 5: Solve for x
   x = 2,123,649.72/1,674.96
6. Step 6: Final answer
   x = 1,267.88