Finding the Fourth Proportional to 1,404.95, 1,939.22 and 815.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.95 : 1,939.22 = 815.37 : x
2. Step 2: Convert to fraction form
   1,404.95/1,939.22 = 815.37/x
3. Step 3: Cross multiply
   1,404.95x = 1,939.22 × 815.37
4. Step 4: Simplify right side
   1,404.95x = 1,581,178.11
5. Step 5: Solve for x
   x = 1,581,178.11/1,404.95
6. Step 6: Final answer
   x = 1,125.44