Finding the Fourth Proportional to 6,978.34, 9,630.55 and 3,994.11

Step by Step Solution

1. Step 1: Write the proportion equation
   6,978.34 : 9,630.55 = 3,994.11 : x
2. Step 2: Convert to fraction form
   6,978.34/9,630.55 = 3,994.11/x
3. Step 3: Cross multiply
   6,978.34x = 9,630.55 × 3,994.11
4. Step 4: Simplify right side
   6,978.34x = 38,465,458.59
5. Step 5: Solve for x
   x = 38,465,458.59/6,978.34
6. Step 6: Final answer
   x = 5,512.12