Finding the Fourth Proportional to 2,086.80, 3,127.47 and 852.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.80 : 3,127.47 = 852.75 : x
2. Step 2: Convert to fraction form
   2,086.80/3,127.47 = 852.75/x
3. Step 3: Cross multiply
   2,086.80x = 3,127.47 × 852.75
4. Step 4: Simplify right side
   2,086.80x = 2,666,950.04
5. Step 5: Solve for x
   x = 2,666,950.04/2,086.80
6. Step 6: Final answer
   x = 1,278.01