Finding the Fourth Proportional to 2,917.78, 4,375.35 and 837.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,917.78 : 4,375.35 = 837.31 : x
2. Step 2: Convert to fraction form
   2,917.78/4,375.35 = 837.31/x
3. Step 3: Cross multiply
   2,917.78x = 4,375.35 × 837.31
4. Step 4: Simplify right side
   2,917.78x = 3,663,502.43
5. Step 5: Solve for x
   x = 3,663,502.43/2,917.78
6. Step 6: Final answer
   x = 1,255.58