Finding the Fourth Proportional to 2,543.10, 3,815.85 and 900.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.10 : 3,815.85 = 900.42 : x
2. Step 2: Convert to fraction form
   2,543.10/3,815.85 = 900.42/x
3. Step 3: Cross multiply
   2,543.10x = 3,815.85 × 900.42
4. Step 4: Simplify right side
   2,543.10x = 3,435,867.66
5. Step 5: Solve for x
   x = 3,435,867.66/2,543.10
6. Step 6: Final answer
   x = 1,351.05