Finding the Fourth Proportional to 1,615.16, 2,228.37 and 985.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.16 : 2,228.37 = 985.52 : x
2. Step 2: Convert to fraction form
   1,615.16/2,228.37 = 985.52/x
3. Step 3: Cross multiply
   1,615.16x = 2,228.37 × 985.52
4. Step 4: Simplify right side
   1,615.16x = 2,196,103.20
5. Step 5: Solve for x
   x = 2,196,103.20/1,615.16
6. Step 6: Final answer
   x = 1,359.68