Finding the Fourth Proportional to 1,986.50, 2,741.37 and 1,287.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.50 : 2,741.37 = 1,287.88 : x
2. Step 2: Convert to fraction form
   1,986.50/2,741.37 = 1,287.88/x
3. Step 3: Cross multiply
   1,986.50x = 2,741.37 × 1,287.88
4. Step 4: Simplify right side
   1,986.50x = 3,530,541.89
5. Step 5: Solve for x
   x = 3,530,541.89/1,986.50
6. Step 6: Final answer
   x = 1,777.27