Finding the Fourth Proportional to 1,039.05, 1,435.71 and 830.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.05 : 1,435.71 = 830.94 : x
2. Step 2: Convert to fraction form
   1,039.05/1,435.71 = 830.94/x
3. Step 3: Cross multiply
   1,039.05x = 1,435.71 × 830.94
4. Step 4: Simplify right side
   1,039.05x = 1,192,988.87
5. Step 5: Solve for x
   x = 1,192,988.87/1,039.05
6. Step 6: Final answer
   x = 1,148.15