Finding the Fourth Proportional to 1,986.95, 2,735.76 and 1,687.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.95 : 2,735.76 = 1,687.57 : x
2. Step 2: Convert to fraction form
   1,986.95/2,735.76 = 1,687.57/x
3. Step 3: Cross multiply
   1,986.95x = 2,735.76 × 1,687.57
4. Step 4: Simplify right side
   1,986.95x = 4,616,786.50
5. Step 5: Solve for x
   x = 4,616,786.50/1,986.95
6. Step 6: Final answer
   x = 2,323.55