Finding the Fourth Proportional to 2,150.34, 3,223.11 and 918.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.34 : 3,223.11 = 918.78 : x
2. Step 2: Convert to fraction form
   2,150.34/3,223.11 = 918.78/x
3. Step 3: Cross multiply
   2,150.34x = 3,223.11 × 918.78
4. Step 4: Simplify right side
   2,150.34x = 2,961,329.01
5. Step 5: Solve for x
   x = 2,961,329.01/2,150.34
6. Step 6: Final answer
   x = 1,377.14