Finding the Fourth Proportional to 1,404.87, 1,938.68 and 815.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.87 : 1,938.68 = 815.38 : x
2. Step 2: Convert to fraction form
   1,404.87/1,938.68 = 815.38/x
3. Step 3: Cross multiply
   1,404.87x = 1,938.68 × 815.38
4. Step 4: Simplify right side
   1,404.87x = 1,580,751.40
5. Step 5: Solve for x
   x = 1,580,751.40/1,404.87
6. Step 6: Final answer
   x = 1,125.19