Finding the Fourth Proportional to 1,404.91, 1,938.45 and 815.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.91 : 1,938.45 = 815.48 : x
2. Step 2: Convert to fraction form
   1,404.91/1,938.45 = 815.48/x
3. Step 3: Cross multiply
   1,404.91x = 1,938.45 × 815.48
4. Step 4: Simplify right side
   1,404.91x = 1,580,767.21
5. Step 5: Solve for x
   x = 1,580,767.21/1,404.91
6. Step 6: Final answer
   x = 1,125.17