Finding the Fourth Proportional to 2,011.50, 3,016.98 and 915.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.50 : 3,016.98 = 915.57 : x
2. Step 2: Convert to fraction form
   2,011.50/3,016.98 = 915.57/x
3. Step 3: Cross multiply
   2,011.50x = 3,016.98 × 915.57
4. Step 4: Simplify right side
   2,011.50x = 2,762,256.38
5. Step 5: Solve for x
   x = 2,762,256.38/2,011.50
6. Step 6: Final answer
   x = 1,373.23