Finding the Fourth Proportional to 1,478.39, 2,040.12 and 815.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.39 : 2,040.12 = 815.27 : x
2. Step 2: Convert to fraction form
   1,478.39/2,040.12 = 815.27/x
3. Step 3: Cross multiply
   1,478.39x = 2,040.12 × 815.27
4. Step 4: Simplify right side
   1,478.39x = 1,663,238.43
5. Step 5: Solve for x
   x = 1,663,238.43/1,478.39
6. Step 6: Final answer
   x = 1,125.04