Finding the Fourth Proportional to 1,134.89, 1,565.59 and 985.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,134.89 : 1,565.59 = 985.31 : x
2. Step 2: Convert to fraction form
   1,134.89/1,565.59 = 985.31/x
3. Step 3: Cross multiply
   1,134.89x = 1,565.59 × 985.31
4. Step 4: Simplify right side
   1,134.89x = 1,542,597.72
5. Step 5: Solve for x
   x = 1,542,597.72/1,134.89
6. Step 6: Final answer
   x = 1,359.24