Finding the Fourth Proportional to 2,211.87, 3,052.30 and 1,217.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.87 : 3,052.30 = 1,217.05 : x
2. Step 2: Convert to fraction form
   2,211.87/3,052.30 = 1,217.05/x
3. Step 3: Cross multiply
   2,211.87x = 3,052.30 × 1,217.05
4. Step 4: Simplify right side
   2,211.87x = 3,714,801.72
5. Step 5: Solve for x
   x = 3,714,801.72/2,211.87
6. Step 6: Final answer
   x = 1,679.48