Finding the Fourth Proportional to 2,725.12, 4,086.72 and 1,185.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,725.12 : 4,086.72 = 1,185.28 : x
2. Step 2: Convert to fraction form
   2,725.12/4,086.72 = 1,185.28/x
3. Step 3: Cross multiply
   2,725.12x = 4,086.72 × 1,185.28
4. Step 4: Simplify right side
   2,725.12x = 4,843,907.48
5. Step 5: Solve for x
   x = 4,843,907.48/2,725.12
6. Step 6: Final answer
   x = 1,777.50