Finding the Fourth Proportional to 2,164.46, 2,987.34 and 1,280.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.46 : 2,987.34 = 1,280.70 : x
2. Step 2: Convert to fraction form
   2,164.46/2,987.34 = 1,280.70/x
3. Step 3: Cross multiply
   2,164.46x = 2,987.34 × 1,280.70
4. Step 4: Simplify right side
   2,164.46x = 3,825,886.34
5. Step 5: Solve for x
   x = 3,825,886.34/2,164.46
6. Step 6: Final answer
   x = 1,767.59