Finding the Fourth Proportional to 1,478.48, 2,040.27 and 815.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.48 : 2,040.27 = 815.34 : x
2. Step 2: Convert to fraction form
   1,478.48/2,040.27 = 815.34/x
3. Step 3: Cross multiply
   1,478.48x = 2,040.27 × 815.34
4. Step 4: Simplify right side
   1,478.48x = 1,663,518.34
5. Step 5: Solve for x
   x = 1,663,518.34/1,478.48
6. Step 6: Final answer
   x = 1,125.16