Finding the Fourth Proportional to 2,012.42, 3,016.20 and 915.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,012.42 : 3,016.20 = 915.28 : x
2. Step 2: Convert to fraction form
   2,012.42/3,016.20 = 915.28/x
3. Step 3: Cross multiply
   2,012.42x = 3,016.20 × 915.28
4. Step 4: Simplify right side
   2,012.42x = 2,760,667.54
5. Step 5: Solve for x
   x = 2,760,667.54/2,012.42
6. Step 6: Final answer
   x = 1,371.81