Finding the Fourth Proportional to 2,187.90, 3,019.33 and 1,291.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.90 : 3,019.33 = 1,291.67 : x
2. Step 2: Convert to fraction form
   2,187.90/3,019.33 = 1,291.67/x
3. Step 3: Cross multiply
   2,187.90x = 3,019.33 × 1,291.67
4. Step 4: Simplify right side
   2,187.90x = 3,899,975.82
5. Step 5: Solve for x
   x = 3,899,975.82/2,187.90
6. Step 6: Final answer
   x = 1,782.52