Finding the Fourth Proportional to 2,047.41, 3,071.16 and 815.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,047.41 : 3,071.16 = 815.40 : x
2. Step 2: Convert to fraction form
   2,047.41/3,071.16 = 815.40/x
3. Step 3: Cross multiply
   2,047.41x = 3,071.16 × 815.40
4. Step 4: Simplify right side
   2,047.41x = 2,504,223.86
5. Step 5: Solve for x
   x = 2,504,223.86/2,047.41
6. Step 6: Final answer
   x = 1,223.12