Finding the Fourth Proportional to 5,385.20, 7,429.46 and 3,972.27

Step by Step Solution

1. Step 1: Write the proportion equation
   5,385.20 : 7,429.46 = 3,972.27 : x
2. Step 2: Convert to fraction form
   5,385.20/7,429.46 = 3,972.27/x
3. Step 3: Cross multiply
   5,385.20x = 7,429.46 × 3,972.27
4. Step 4: Simplify right side
   5,385.20x = 29,511,801.21
5. Step 5: Solve for x
   x = 29,511,801.21/5,385.20
6. Step 6: Final answer
   x = 5,480.17