Finding the Fourth Proportional to 1,309.31, 1,809.71 and 1,150.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,309.31 : 1,809.71 = 1,150.75 : x
2. Step 2: Convert to fraction form
   1,309.31/1,809.71 = 1,150.75/x
3. Step 3: Cross multiply
   1,309.31x = 1,809.71 × 1,150.75
4. Step 4: Simplify right side
   1,309.31x = 2,082,524.61
5. Step 5: Solve for x
   x = 2,082,524.61/1,309.31
6. Step 6: Final answer
   x = 1,590.55