Finding the Fourth Proportional to 3,155.35, 4,732.99 and 815.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,155.35 : 4,732.99 = 815.15 : x
2. Step 2: Convert to fraction form
   3,155.35/4,732.99 = 815.15/x
3. Step 3: Cross multiply
   3,155.35x = 4,732.99 × 815.15
4. Step 4: Simplify right side
   3,155.35x = 3,858,096.80
5. Step 5: Solve for x
   x = 3,858,096.80/3,155.35
6. Step 6: Final answer
   x = 1,222.72