Finding the Fourth Proportional to 1,915.72, 2,643.72 and 1,076.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.72 : 2,643.72 = 1,076.48 : x
2. Step 2: Convert to fraction form
   1,915.72/2,643.72 = 1,076.48/x
3. Step 3: Cross multiply
   1,915.72x = 2,643.72 × 1,076.48
4. Step 4: Simplify right side
   1,915.72x = 2,845,911.71
5. Step 5: Solve for x
   x = 2,845,911.71/1,915.72
6. Step 6: Final answer
   x = 1,485.56