Finding the Fourth Proportional to 1,605.58, 2,215.17 and 897.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.58 : 2,215.17 = 897.30 : x
2. Step 2: Convert to fraction form
   1,605.58/2,215.17 = 897.30/x
3. Step 3: Cross multiply
   1,605.58x = 2,215.17 × 897.30
4. Step 4: Simplify right side
   1,605.58x = 1,987,672.04
5. Step 5: Solve for x
   x = 1,987,672.04/1,605.58
6. Step 6: Final answer
   x = 1,237.98