Finding the Fourth Proportional to 2,187.17, 3,019.34 and 1,290.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.17 : 3,019.34 = 1,290.59 : x
2. Step 2: Convert to fraction form
   2,187.17/3,019.34 = 1,290.59/x
3. Step 3: Cross multiply
   2,187.17x = 3,019.34 × 1,290.59
4. Step 4: Simplify right side
   2,187.17x = 3,896,720.67
5. Step 5: Solve for x
   x = 3,896,720.67/2,187.17
6. Step 6: Final answer
   x = 1,781.63