Finding the Fourth Proportional to 1,404.60, 1,938.30 and 815.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.60 : 1,938.30 = 815.10 : x
2. Step 2: Convert to fraction form
   1,404.60/1,938.30 = 815.10/x
3. Step 3: Cross multiply
   1,404.60x = 1,938.30 × 815.10
4. Step 4: Simplify right side
   1,404.60x = 1,579,908.33
5. Step 5: Solve for x
   x = 1,579,908.33/1,404.60
6. Step 6: Final answer
   x = 1,124.81