Finding the Fourth Proportional to 1,294.72, 1,785.69 and 915.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,294.72 : 1,785.69 = 915.94 : x
2. Step 2: Convert to fraction form
   1,294.72/1,785.69 = 915.94/x
3. Step 3: Cross multiply
   1,294.72x = 1,785.69 × 915.94
4. Step 4: Simplify right side
   1,294.72x = 1,635,584.90
5. Step 5: Solve for x
   x = 1,635,584.90/1,294.72
6. Step 6: Final answer
   x = 1,263.27