Finding the Fourth Proportional to 1,404.36, 1,938.20 and 815.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.36 : 1,938.20 = 815.08 : x
2. Step 2: Convert to fraction form
   1,404.36/1,938.20 = 815.08/x
3. Step 3: Cross multiply
   1,404.36x = 1,938.20 × 815.08
4. Step 4: Simplify right side
   1,404.36x = 1,579,788.06
5. Step 5: Solve for x
   x = 1,579,788.06/1,404.36
6. Step 6: Final answer
   x = 1,124.92