Finding the Fourth Proportional to 1,131.86, 1,698.18 and 809.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.86 : 1,698.18 = 809.74 : x
2. Step 2: Convert to fraction form
   1,131.86/1,698.18 = 809.74/x
3. Step 3: Cross multiply
   1,131.86x = 1,698.18 × 809.74
4. Step 4: Simplify right side
   1,131.86x = 1,375,084.27
5. Step 5: Solve for x
   x = 1,375,084.27/1,131.86
6. Step 6: Final answer
   x = 1,214.89