Finding the Fourth Proportional to 1,039.62, 1,433.24 and 830.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.62 : 1,433.24 = 830.50 : x
2. Step 2: Convert to fraction form
   1,039.62/1,433.24 = 830.50/x
3. Step 3: Cross multiply
   1,039.62x = 1,433.24 × 830.50
4. Step 4: Simplify right side
   1,039.62x = 1,190,305.82
5. Step 5: Solve for x
   x = 1,190,305.82/1,039.62
6. Step 6: Final answer
   x = 1,144.94