Finding the Fourth Proportional to 1,597.91, 2,398.31 and 818.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,597.91 : 2,398.31 = 818.45 : x
2. Step 2: Convert to fraction form
   1,597.91/2,398.31 = 818.45/x
3. Step 3: Cross multiply
   1,597.91x = 2,398.31 × 818.45
4. Step 4: Simplify right side
   1,597.91x = 1,962,896.82
5. Step 5: Solve for x
   x = 1,962,896.82/1,597.91
6. Step 6: Final answer
   x = 1,228.42