Finding the Fourth Proportional to 2,162.79, 2,984.81 and 1,278.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.79 : 2,984.81 = 1,278.57 : x
2. Step 2: Convert to fraction form
   2,162.79/2,984.81 = 1,278.57/x
3. Step 3: Cross multiply
   2,162.79x = 2,984.81 × 1,278.57
4. Step 4: Simplify right side
   2,162.79x = 3,816,288.52
5. Step 5: Solve for x
   x = 3,816,288.52/2,162.79
6. Step 6: Final answer
   x = 1,764.52