Finding the Fourth Proportional to 7,086.72, 9,779.70 and 3,942.96

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.72 : 9,779.70 = 3,942.96 : x
2. Step 2: Convert to fraction form
   7,086.72/9,779.70 = 3,942.96/x
3. Step 3: Cross multiply
   7,086.72x = 9,779.70 × 3,942.96
4. Step 4: Simplify right side
   7,086.72x = 38,560,965.91
5. Step 5: Solve for x
   x = 38,560,965.91/7,086.72
6. Step 6: Final answer
   x = 5,441.30