Finding the Fourth Proportional to 1,478.43, 2,040.16 and 815.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.43 : 2,040.16 = 815.16 : x
2. Step 2: Convert to fraction form
   1,478.43/2,040.16 = 815.16/x
3. Step 3: Cross multiply
   1,478.43x = 2,040.16 × 815.16
4. Step 4: Simplify right side
   1,478.43x = 1,663,056.83
5. Step 5: Solve for x
   x = 1,663,056.83/1,478.43
6. Step 6: Final answer
   x = 1,124.88