Finding the Fourth Proportional to 2,016, 2,781.60 and 1,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016 : 2,781.60 = 1,131.72 : x
2. Step 2: Convert to fraction form
   2,016/2,781.60 = 1,131.72/x
3. Step 3: Cross multiply
   2,016x = 2,781.60 × 1,131.72
4. Step 4: Simplify right side
   2,016x = 3,147,992.35
5. Step 5: Solve for x
   x = 3,147,992.35/2,016
6. Step 6: Final answer
   x = 1,561.50