Finding the Fourth Proportional to 2,587.83, 3,564.41 and 1,989.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.83 : 3,564.41 = 1,989.17 : x
2. Step 2: Convert to fraction form
   2,587.83/3,564.41 = 1,989.17/x
3. Step 3: Cross multiply
   2,587.83x = 3,564.41 × 1,989.17
4. Step 4: Simplify right side
   2,587.83x = 7,090,223.09
5. Step 5: Solve for x
   x = 7,090,223.09/2,587.83
6. Step 6: Final answer
   x = 2,739.83