Finding the Fourth Proportional to 1,404.68, 1,938.26 and 815.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.68 : 1,938.26 = 815.08 : x
2. Step 2: Convert to fraction form
   1,404.68/1,938.26 = 815.08/x
3. Step 3: Cross multiply
   1,404.68x = 1,938.26 × 815.08
4. Step 4: Simplify right side
   1,404.68x = 1,579,836.96
5. Step 5: Solve for x
   x = 1,579,836.96/1,404.68
6. Step 6: Final answer
   x = 1,124.70