Finding the Fourth Proportional to 1,615.82, 2,228.31 and 1,285.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.82 : 2,228.31 = 1,285.34 : x
2. Step 2: Convert to fraction form
   1,615.82/2,228.31 = 1,285.34/x
3. Step 3: Cross multiply
   1,615.82x = 2,228.31 × 1,285.34
4. Step 4: Simplify right side
   1,615.82x = 2,864,124.83
5. Step 5: Solve for x
   x = 2,864,124.83/1,615.82
6. Step 6: Final answer
   x = 1,772.56