Finding the Fourth Proportional to 5,670.27, 7,821.43 and 3,898.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,670.27 : 7,821.43 = 3,898.80 : x
2. Step 2: Convert to fraction form
   5,670.27/7,821.43 = 3,898.80/x
3. Step 3: Cross multiply
   5,670.27x = 7,821.43 × 3,898.80
4. Step 4: Simplify right side
   5,670.27x = 30,494,181.54
5. Step 5: Solve for x
   x = 30,494,181.54/5,670.27
6. Step 6: Final answer
   x = 5,377.91