Finding the Fourth Proportional to 2,918.74, 4,378.89 and 1,275.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,918.74 : 4,378.89 = 1,275.42 : x
2. Step 2: Convert to fraction form
   2,918.74/4,378.89 = 1,275.42/x
3. Step 3: Cross multiply
   2,918.74x = 4,378.89 × 1,275.42
4. Step 4: Simplify right side
   2,918.74x = 5,584,923.88
5. Step 5: Solve for x
   x = 5,584,923.88/2,918.74
6. Step 6: Final answer
   x = 1,913.47