Finding the Fourth Proportional to 1,086.82, 1,631.47 and 826.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.82 : 1,631.47 = 826.18 : x
2. Step 2: Convert to fraction form
   1,086.82/1,631.47 = 826.18/x
3. Step 3: Cross multiply
   1,086.82x = 1,631.47 × 826.18
4. Step 4: Simplify right side
   1,086.82x = 1,347,887.88
5. Step 5: Solve for x
   x = 1,347,887.88/1,086.82
6. Step 6: Final answer
   x = 1,240.21