Finding the Fourth Proportional to 3,969.84, 5,942.42 and 2,931

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.84 : 5,942.42 = 2,931 : x
2. Step 2: Convert to fraction form
   3,969.84/5,942.42 = 2,931/x
3. Step 3: Cross multiply
   3,969.84x = 5,942.42 × 2,931
4. Step 4: Simplify right side
   3,969.84x = 17,417,233.02
5. Step 5: Solve for x
   x = 17,417,233.02/3,969.84
6. Step 6: Final answer
   x = 4,387.39