Finding the Fourth Proportional to 2,659.58, 3,986.82 and 1,272.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.58 : 3,986.82 = 1,272.55 : x
2. Step 2: Convert to fraction form
   2,659.58/3,986.82 = 1,272.55/x
3. Step 3: Cross multiply
   2,659.58x = 3,986.82 × 1,272.55
4. Step 4: Simplify right side
   2,659.58x = 5,073,427.79
5. Step 5: Solve for x
   x = 5,073,427.79/2,659.58
6. Step 6: Final answer
   x = 1,907.60