Finding the Fourth Proportional to 6,978.94, 9,631.42 and 3,954.03

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.94 : 9,631.42 = 3,954.03 : x
2. Step 2: Convert to fraction form
   6,978.94/9,631.42 = 3,954.03/x
3. Step 3: Cross multiply
   6,978.94x = 9,631.42 × 3,954.03
4. Step 4: Simplify right side
   6,978.94x = 38,082,913.74
5. Step 5: Solve for x
   x = 38,082,913.74/6,978.94
6. Step 6: Final answer
   x = 5,456.84