Finding the Fourth Proportional to 2,164.93, 2,987.55 and 1,280.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.93 : 2,987.55 = 1,280.75 : x
2. Step 2: Convert to fraction form
   2,164.93/2,987.55 = 1,280.75/x
3. Step 3: Cross multiply
   2,164.93x = 2,987.55 × 1,280.75
4. Step 4: Simplify right side
   2,164.93x = 3,826,289.72
5. Step 5: Solve for x
   x = 3,826,289.72/2,164.93
6. Step 6: Final answer
   x = 1,767.40