Finding the Fourth Proportional to 1,404.92, 1,938.75 and 815.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.92 : 1,938.75 = 815.43 : x
2. Step 2: Convert to fraction form
   1,404.92/1,938.75 = 815.43/x
3. Step 3: Cross multiply
   1,404.92x = 1,938.75 × 815.43
4. Step 4: Simplify right side
   1,404.92x = 1,580,914.91
5. Step 5: Solve for x
   x = 1,580,914.91/1,404.92
6. Step 6: Final answer
   x = 1,125.27