Finding the Fourth Proportional to 1,605.74, 2,215.92 and 897.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.74 : 2,215.92 = 897.57 : x
2. Step 2: Convert to fraction form
   1,605.74/2,215.92 = 897.57/x
3. Step 3: Cross multiply
   1,605.74x = 2,215.92 × 897.57
4. Step 4: Simplify right side
   1,605.74x = 1,988,943.31
5. Step 5: Solve for x
   x = 1,988,943.31/1,605.74
6. Step 6: Final answer
   x = 1,238.65