Finding the Fourth Proportional to 2,126.82, 3,191.46 and 828.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,126.82 : 3,191.46 = 828.18 : x
2. Step 2: Convert to fraction form
   2,126.82/3,191.46 = 828.18/x
3. Step 3: Cross multiply
   2,126.82x = 3,191.46 × 828.18
4. Step 4: Simplify right side
   2,126.82x = 2,643,103.34
5. Step 5: Solve for x
   x = 2,643,103.34/2,126.82
6. Step 6: Final answer
   x = 1,242.75