Finding the Fourth Proportional to 1,609.72, 2,231.83 and 1,555.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.72 : 2,231.83 = 1,555.72 : x
2. Step 2: Convert to fraction form
   1,609.72/2,231.83 = 1,555.72/x
3. Step 3: Cross multiply
   1,609.72x = 2,231.83 × 1,555.72
4. Step 4: Simplify right side
   1,609.72x = 3,472,102.57
5. Step 5: Solve for x
   x = 3,472,102.57/1,609.72
6. Step 6: Final answer
   x = 2,156.96