Finding the Fourth Proportional to 1,986.52, 2,740.61 and 1,278.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.52 : 2,740.61 = 1,278.25 : x
2. Step 2: Convert to fraction form
   1,986.52/2,740.61 = 1,278.25/x
3. Step 3: Cross multiply
   1,986.52x = 2,740.61 × 1,278.25
4. Step 4: Simplify right side
   1,986.52x = 3,503,184.73
5. Step 5: Solve for x
   x = 3,503,184.73/1,986.52
6. Step 6: Final answer
   x = 1,763.48