Finding the Fourth Proportional to 1,915.71, 2,643.72 and 1,076.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.71 : 2,643.72 = 1,076.61 : x
2. Step 2: Convert to fraction form
   1,915.71/2,643.72 = 1,076.61/x
3. Step 3: Cross multiply
   1,915.71x = 2,643.72 × 1,076.61
4. Step 4: Simplify right side
   1,915.71x = 2,846,255.39
5. Step 5: Solve for x
   x = 2,846,255.39/1,915.71
6. Step 6: Final answer
   x = 1,485.74