Finding the Fourth Proportional to 2,087.84, 2,878.22 and 1,290.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.84 : 2,878.22 = 1,290.62 : x
2. Step 2: Convert to fraction form
   2,087.84/2,878.22 = 1,290.62/x
3. Step 3: Cross multiply
   2,087.84x = 2,878.22 × 1,290.62
4. Step 4: Simplify right side
   2,087.84x = 3,714,689.04
5. Step 5: Solve for x
   x = 3,714,689.04/2,087.84
6. Step 6: Final answer
   x = 1,779.21