Finding the Fourth Proportional to 1,391.82, 2,086.65 and 814.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.82 : 2,086.65 = 814.02 : x
2. Step 2: Convert to fraction form
   1,391.82/2,086.65 = 814.02/x
3. Step 3: Cross multiply
   1,391.82x = 2,086.65 × 814.02
4. Step 4: Simplify right side
   1,391.82x = 1,698,574.83
5. Step 5: Solve for x
   x = 1,698,574.83/1,391.82
6. Step 6: Final answer
   x = 1,220.40