Finding the Fourth Proportional to 1,478.56, 2,040.34 and 815.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.56 : 2,040.34 = 815.47 : x
2. Step 2: Convert to fraction form
   1,478.56/2,040.34 = 815.47/x
3. Step 3: Cross multiply
   1,478.56x = 2,040.34 × 815.47
4. Step 4: Simplify right side
   1,478.56x = 1,663,836.06
5. Step 5: Solve for x
   x = 1,663,836.06/1,478.56
6. Step 6: Final answer
   x = 1,125.31