Finding the Fourth Proportional to 1,404.94, 1,938.39 and 815.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.94 : 1,938.39 = 815.36 : x
2. Step 2: Convert to fraction form
   1,404.94/1,938.39 = 815.36/x
3. Step 3: Cross multiply
   1,404.94x = 1,938.39 × 815.36
4. Step 4: Simplify right side
   1,404.94x = 1,580,481.59
5. Step 5: Solve for x
   x = 1,580,481.59/1,404.94
6. Step 6: Final answer
   x = 1,124.95