Finding the Fourth Proportional to 1,404.83, 1,938.65 and 815.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.83 : 1,938.65 = 815.70 : x
2. Step 2: Convert to fraction form
   1,404.83/1,938.65 = 815.70/x
3. Step 3: Cross multiply
   1,404.83x = 1,938.65 × 815.70
4. Step 4: Simplify right side
   1,404.83x = 1,581,352.73
5. Step 5: Solve for x
   x = 1,581,352.73/1,404.83
6. Step 6: Final answer
   x = 1,125.66