Finding the Fourth Proportional to 2,164.74, 2,987.39 and 1,280.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.74 : 2,987.39 = 1,280.22 : x
2. Step 2: Convert to fraction form
   2,164.74/2,987.39 = 1,280.22/x
3. Step 3: Cross multiply
   2,164.74x = 2,987.39 × 1,280.22
4. Step 4: Simplify right side
   2,164.74x = 3,824,516.43
5. Step 5: Solve for x
   x = 3,824,516.43/2,164.74
6. Step 6: Final answer
   x = 1,766.73