Finding the Fourth Proportional to 1,613.58, 2,228.55 and 1,438.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.58 : 2,228.55 = 1,438.62 : x
2. Step 2: Convert to fraction form
   1,613.58/2,228.55 = 1,438.62/x
3. Step 3: Cross multiply
   1,613.58x = 2,228.55 × 1,438.62
4. Step 4: Simplify right side
   1,613.58x = 3,206,036.60
5. Step 5: Solve for x
   x = 3,206,036.60/1,613.58
6. Step 6: Final answer
   x = 1,986.91