Finding the Fourth Proportional to 1,609.38, 2,221.83 and 1,315.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.38 : 2,221.83 = 1,315.62 : x
2. Step 2: Convert to fraction form
   1,609.38/2,221.83 = 1,315.62/x
3. Step 3: Cross multiply
   1,609.38x = 2,221.83 × 1,315.62
4. Step 4: Simplify right side
   1,609.38x = 2,923,083.98
5. Step 5: Solve for x
   x = 2,923,083.98/1,609.38
6. Step 6: Final answer
   x = 1,816.28