Finding the Fourth Proportional to 2,011.31, 3,017.42 and 915.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.31 : 3,017.42 = 915.38 : x
2. Step 2: Convert to fraction form
   2,011.31/3,017.42 = 915.38/x
3. Step 3: Cross multiply
   2,011.31x = 3,017.42 × 915.38
4. Step 4: Simplify right side
   2,011.31x = 2,762,085.92
5. Step 5: Solve for x
   x = 2,762,085.92/2,011.31
6. Step 6: Final answer
   x = 1,373.28