Finding the Fourth Proportional to 1,131.12, 1,560.83 and 665.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.12 : 1,560.83 = 665.37 : x
2. Step 2: Convert to fraction form
   1,131.12/1,560.83 = 665.37/x
3. Step 3: Cross multiply
   1,131.12x = 1,560.83 × 665.37
4. Step 4: Simplify right side
   1,131.12x = 1,038,526.13
5. Step 5: Solve for x
   x = 1,038,526.13/1,131.12
6. Step 6: Final answer
   x = 918.14