Finding the Fourth Proportional to 1,605.57, 2,215.56 and 897.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.57 : 2,215.56 = 897.38 : x
2. Step 2: Convert to fraction form
   1,605.57/2,215.56 = 897.38/x
3. Step 3: Cross multiply
   1,605.57x = 2,215.56 × 897.38
4. Step 4: Simplify right side
   1,605.57x = 1,988,195.67
5. Step 5: Solve for x
   x = 1,988,195.67/1,605.57
6. Step 6: Final answer
   x = 1,238.31