Finding the Fourth Proportional to 2,148.55, 2,964.91 and 1,217.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.55 : 2,964.91 = 1,217.05 : x
2. Step 2: Convert to fraction form
   2,148.55/2,964.91 = 1,217.05/x
3. Step 3: Cross multiply
   2,148.55x = 2,964.91 × 1,217.05
4. Step 4: Simplify right side
   2,148.55x = 3,608,443.72
5. Step 5: Solve for x
   x = 3,608,443.72/2,148.55
6. Step 6: Final answer
   x = 1,679.48