Finding the Fourth Proportional to 1,131.12, 1,694.52 and 805.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.12 : 1,694.52 = 805.50 : x
2. Step 2: Convert to fraction form
   1,131.12/1,694.52 = 805.50/x
3. Step 3: Cross multiply
   1,131.12x = 1,694.52 × 805.50
4. Step 4: Simplify right side
   1,131.12x = 1,364,935.86
5. Step 5: Solve for x
   x = 1,364,935.86/1,131.12
6. Step 6: Final answer
   x = 1,206.71