Finding the Fourth Proportional to 2,180.31, 3,008.81 and 1,284.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,180.31 : 3,008.81 = 1,284.57 : x
2. Step 2: Convert to fraction form
   2,180.31/3,008.81 = 1,284.57/x
3. Step 3: Cross multiply
   2,180.31x = 3,008.81 × 1,284.57
4. Step 4: Simplify right side
   2,180.31x = 3,865,015.23
5. Step 5: Solve for x
   x = 3,865,015.23/2,180.31
6. Step 6: Final answer
   x = 1,772.69