Finding the Fourth Proportional to 2,758.42, 4,138.33 and 810.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758.42 : 4,138.33 = 810.63 : x
2. Step 2: Convert to fraction form
   2,758.42/4,138.33 = 810.63/x
3. Step 3: Cross multiply
   2,758.42x = 4,138.33 × 810.63
4. Step 4: Simplify right side
   2,758.42x = 3,354,654.45
5. Step 5: Solve for x
   x = 3,354,654.45/2,758.42
6. Step 6: Final answer
   x = 1,216.15