Finding the Fourth Proportional to 1,627.16, 2,245.37 and 918.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,627.16 : 2,245.37 = 918.78 : x
2. Step 2: Convert to fraction form
   1,627.16/2,245.37 = 918.78/x
3. Step 3: Cross multiply
   1,627.16x = 2,245.37 × 918.78
4. Step 4: Simplify right side
   1,627.16x = 2,062,996.45
5. Step 5: Solve for x
   x = 2,062,996.45/1,627.16
6. Step 6: Final answer
   x = 1,267.85