Finding the Fourth Proportional to 1,615.38, 2,228.00 and 1,391.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.38 : 2,228.00 = 1,391.69 : x
2. Step 2: Convert to fraction form
   1,615.38/2,228.00 = 1,391.69/x
3. Step 3: Cross multiply
   1,615.38x = 2,228.00 × 1,391.69
4. Step 4: Simplify right side
   1,615.38x = 3,100,678.36
5. Step 5: Solve for x
   x = 3,100,678.36/1,615.38
6. Step 6: Final answer
   x = 1,919.48