Finding the Fourth Proportional to 2,191.76, 3,288.12 and 711.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,191.76 : 3,288.12 = 711.12 : x
2. Step 2: Convert to fraction form
   2,191.76/3,288.12 = 711.12/x
3. Step 3: Cross multiply
   2,191.76x = 3,288.12 × 711.12
4. Step 4: Simplify right side
   2,191.76x = 2,338,247.89
5. Step 5: Solve for x
   x = 2,338,247.89/2,191.76
6. Step 6: Final answer
   x = 1,066.84