Finding the Fourth Proportional to 1,859.31, 2,789.53 and 818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.31 : 2,789.53 = 818.82 : x
2. Step 2: Convert to fraction form
   1,859.31/2,789.53 = 818.82/x
3. Step 3: Cross multiply
   1,859.31x = 2,789.53 × 818.82
4. Step 4: Simplify right side
   1,859.31x = 2,284,120.91
5. Step 5: Solve for x
   x = 2,284,120.91/1,859.31
6. Step 6: Final answer
   x = 1,228.48