Finding the Fourth Proportional to 2,187.87, 3,276.59 and 1,211.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.87 : 3,276.59 = 1,211.55 : x
2. Step 2: Convert to fraction form
   2,187.87/3,276.59 = 1,211.55/x
3. Step 3: Cross multiply
   2,187.87x = 3,276.59 × 1,211.55
4. Step 4: Simplify right side
   2,187.87x = 3,969,746.56
5. Step 5: Solve for x
   x = 3,969,746.56/2,187.87
6. Step 6: Final answer
   x = 1,814.43