Finding the Fourth Proportional to 7,131.99, 9,842.07 and 3,945.42

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.99 : 9,842.07 = 3,945.42 : x
2. Step 2: Convert to fraction form
   7,131.99/9,842.07 = 3,945.42/x
3. Step 3: Cross multiply
   7,131.99x = 9,842.07 × 3,945.42
4. Step 4: Simplify right side
   7,131.99x = 38,831,099.82
5. Step 5: Solve for x
   x = 38,831,099.82/7,131.99
6. Step 6: Final answer
   x = 5,444.64