Finding the Fourth Proportional to 1,613.96, 2,228.58 and 1,315.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.96 : 2,228.58 = 1,315.25 : x
2. Step 2: Convert to fraction form
   1,613.96/2,228.58 = 1,315.25/x
3. Step 3: Cross multiply
   1,613.96x = 2,228.58 × 1,315.25
4. Step 4: Simplify right side
   1,613.96x = 2,931,139.85
5. Step 5: Solve for x
   x = 2,931,139.85/1,613.96
6. Step 6: Final answer
   x = 1,816.12