Finding the Fourth Proportional to 1,789.53, 2,683.94 and 815.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.53 : 2,683.94 = 815.39 : x
2. Step 2: Convert to fraction form
   1,789.53/2,683.94 = 815.39/x
3. Step 3: Cross multiply
   1,789.53x = 2,683.94 × 815.39
4. Step 4: Simplify right side
   1,789.53x = 2,188,440.34
5. Step 5: Solve for x
   x = 2,188,440.34/1,789.53
6. Step 6: Final answer
   x = 1,222.91