Finding the Fourth Proportional to 2,147.10, 3,221.15 and 914.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.10 : 3,221.15 = 914.55 : x
2. Step 2: Convert to fraction form
   2,147.10/3,221.15 = 914.55/x
3. Step 3: Cross multiply
   2,147.10x = 3,221.15 × 914.55
4. Step 4: Simplify right side
   2,147.10x = 2,945,898.16
5. Step 5: Solve for x
   x = 2,945,898.16/2,147.10
6. Step 6: Final answer
   x = 1,372.04