Finding the Fourth Proportional to 1,478.91, 2,040.87 and 815.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.91 : 2,040.87 = 815.82 : x
2. Step 2: Convert to fraction form
   1,478.91/2,040.87 = 815.82/x
3. Step 3: Cross multiply
   1,478.91x = 2,040.87 × 815.82
4. Step 4: Simplify right side
   1,478.91x = 1,664,982.56
5. Step 5: Solve for x
   x = 1,664,982.56/1,478.91
6. Step 6: Final answer
   x = 1,125.82