Finding the Fourth Proportional to 1,986.49, 2,741.61 and 1,200.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.49 : 2,741.61 = 1,200.57 : x
2. Step 2: Convert to fraction form
   1,986.49/2,741.61 = 1,200.57/x
3. Step 3: Cross multiply
   1,986.49x = 2,741.61 × 1,200.57
4. Step 4: Simplify right side
   1,986.49x = 3,291,494.72
5. Step 5: Solve for x
   x = 3,291,494.72/1,986.49
6. Step 6: Final answer
   x = 1,656.94