Finding the Fourth Proportional to 5,380.29, 7,424.46 and 3,142.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,380.29 : 7,424.46 = 3,142.80 : x
2. Step 2: Convert to fraction form
   5,380.29/7,424.46 = 3,142.80/x
3. Step 3: Cross multiply
   5,380.29x = 7,424.46 × 3,142.80
4. Step 4: Simplify right side
   5,380.29x = 23,333,592.89
5. Step 5: Solve for x
   x = 23,333,592.89/5,380.29
6. Step 6: Final answer
   x = 4,336.87