Finding the Fourth Proportional to 7,321.28, 10,104.32 and 4,178.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.28 : 10,104.32 = 4,178.12 : x
2. Step 2: Convert to fraction form
   7,321.28/10,104.32 = 4,178.12/x
3. Step 3: Cross multiply
   7,321.28x = 10,104.32 × 4,178.12
4. Step 4: Simplify right side
   7,321.28x = 42,217,061.48
5. Step 5: Solve for x
   x = 42,217,061.48/7,321.28
6. Step 6: Final answer
   x = 5,766.35