Finding the Fourth Proportional to 2,011.68, 3,016.56 and 915.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.68 : 3,016.56 = 915.12 : x
2. Step 2: Convert to fraction form
   2,011.68/3,016.56 = 915.12/x
3. Step 3: Cross multiply
   2,011.68x = 3,016.56 × 915.12
4. Step 4: Simplify right side
   2,011.68x = 2,760,514.39
5. Step 5: Solve for x
   x = 2,760,514.39/2,011.68
6. Step 6: Final answer
   x = 1,372.24