Finding the Fourth Proportional to 3,139, 4,708.82 and 830.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139 : 4,708.82 = 830.50 : x
2. Step 2: Convert to fraction form
   3,139/4,708.82 = 830.50/x
3. Step 3: Cross multiply
   3,139x = 4,708.82 × 830.50
4. Step 4: Simplify right side
   3,139x = 3,910,675.01
5. Step 5: Solve for x
   x = 3,910,675.01/3,139
6. Step 6: Final answer
   x = 1,245.83