Finding the Fourth Proportional to 7,086.53, 9,779.41 and 3,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.53 : 9,779.41 = 3,942.72 : x
2. Step 2: Convert to fraction form
   7,086.53/9,779.41 = 3,942.72/x
3. Step 3: Cross multiply
   7,086.53x = 9,779.41 × 3,942.72
4. Step 4: Simplify right side
   7,086.53x = 38,557,475.40
5. Step 5: Solve for x
   x = 38,557,475.40/7,086.53
6. Step 6: Final answer
   x = 5,440.95