Finding the Fourth Proportional to 2,075.18, 2,863.76 and 1,278.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.18 : 2,863.76 = 1,278.90 : x
2. Step 2: Convert to fraction form
   2,075.18/2,863.76 = 1,278.90/x
3. Step 3: Cross multiply
   2,075.18x = 2,863.76 × 1,278.90
4. Step 4: Simplify right side
   2,075.18x = 3,662,456.27
5. Step 5: Solve for x
   x = 3,662,456.27/2,075.18
6. Step 6: Final answer
   x = 1,764.89