Finding the Fourth Proportional to 1,615.58, 2,228.83 and 985.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.58 : 2,228.83 = 985.61 : x
2. Step 2: Convert to fraction form
   1,615.58/2,228.83 = 985.61/x
3. Step 3: Cross multiply
   1,615.58x = 2,228.83 × 985.61
4. Step 4: Simplify right side
   1,615.58x = 2,196,757.14
5. Step 5: Solve for x
   x = 2,196,757.14/1,615.58
6. Step 6: Final answer
   x = 1,359.73