Finding the Fourth Proportional to 7,086.69, 9,779.63 and 3,942.88

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.69 : 9,779.63 = 3,942.88 : x
2. Step 2: Convert to fraction form
   7,086.69/9,779.63 = 3,942.88/x
3. Step 3: Cross multiply
   7,086.69x = 9,779.63 × 3,942.88
4. Step 4: Simplify right side
   7,086.69x = 38,559,907.53
5. Step 5: Solve for x
   x = 38,559,907.53/7,086.69
6. Step 6: Final answer
   x = 5,441.17