Finding the Fourth Proportional to 1,587.06, 2,187.81 and 1,291.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,587.06 : 2,187.81 = 1,291.82 : x
2. Step 2: Convert to fraction form
   1,587.06/2,187.81 = 1,291.82/x
3. Step 3: Cross multiply
   1,587.06x = 2,187.81 × 1,291.82
4. Step 4: Simplify right side
   1,587.06x = 2,826,245.78
5. Step 5: Solve for x
   x = 2,826,245.78/1,587.06
6. Step 6: Final answer
   x = 1,780.81