Finding the Fourth Proportional to 2,725.78, 4,089.30 and 1,264.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,725.78 : 4,089.30 = 1,264.60 : x
2. Step 2: Convert to fraction form
   2,725.78/4,089.30 = 1,264.60/x
3. Step 3: Cross multiply
   2,725.78x = 4,089.30 × 1,264.60
4. Step 4: Simplify right side
   2,725.78x = 5,171,328.78
5. Step 5: Solve for x
   x = 5,171,328.78/2,725.78
6. Step 6: Final answer
   x = 1,897.19