Finding the Fourth Proportional to 2,011.05, 3,016.67 and 915.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.05 : 3,016.67 = 915.12 : x
2. Step 2: Convert to fraction form
   2,011.05/3,016.67 = 915.12/x
3. Step 3: Cross multiply
   2,011.05x = 3,016.67 × 915.12
4. Step 4: Simplify right side
   2,011.05x = 2,760,610.47
5. Step 5: Solve for x
   x = 2,760,610.47/2,011.05
6. Step 6: Final answer
   x = 1,372.72