Finding the Fourth Proportional to 1,661.76, 2,293.25 and 915.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.76 : 2,293.25 = 915.71 : x
2. Step 2: Convert to fraction form
   1,661.76/2,293.25 = 915.71/x
3. Step 3: Cross multiply
   1,661.76x = 2,293.25 × 915.71
4. Step 4: Simplify right side
   1,661.76x = 2,099,935.91
5. Step 5: Solve for x
   x = 2,099,935.91/1,661.76
6. Step 6: Final answer
   x = 1,263.68