Finding the Fourth Proportional to 1,150.48, 1,583.78 and 1,039.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.48 : 1,583.78 = 1,039.61 : x
2. Step 2: Convert to fraction form
   1,150.48/1,583.78 = 1,039.61/x
3. Step 3: Cross multiply
   1,150.48x = 1,583.78 × 1,039.61
4. Step 4: Simplify right side
   1,150.48x = 1,646,513.53
5. Step 5: Solve for x
   x = 1,646,513.53/1,150.48
6. Step 6: Final answer
   x = 1,431.15