Finding the Fourth Proportional to 2,137.38, 3,203.86 and 905.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.38 : 3,203.86 = 905.55 : x
2. Step 2: Convert to fraction form
   2,137.38/3,203.86 = 905.55/x
3. Step 3: Cross multiply
   2,137.38x = 3,203.86 × 905.55
4. Step 4: Simplify right side
   2,137.38x = 2,901,255.42
5. Step 5: Solve for x
   x = 2,901,255.42/2,137.38
6. Step 6: Final answer
   x = 1,357.39