Finding the Fourth Proportional to 1,311.78, 1,809.49 and 846.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.78 : 1,809.49 = 846.03 : x
2. Step 2: Convert to fraction form
   1,311.78/1,809.49 = 846.03/x
3. Step 3: Cross multiply
   1,311.78x = 1,809.49 × 846.03
4. Step 4: Simplify right side
   1,311.78x = 1,530,882.82
5. Step 5: Solve for x
   x = 1,530,882.82/1,311.78
6. Step 6: Final answer
   x = 1,167.03