Finding the Fourth Proportional to 1,404.16, 1,938.09 and 815.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.16 : 1,938.09 = 815.05 : x
2. Step 2: Convert to fraction form
   1,404.16/1,938.09 = 815.05/x
3. Step 3: Cross multiply
   1,404.16x = 1,938.09 × 815.05
4. Step 4: Simplify right side
   1,404.16x = 1,579,640.25
5. Step 5: Solve for x
   x = 1,579,640.25/1,404.16
6. Step 6: Final answer
   x = 1,124.97