Finding the Fourth Proportional to 5,912.78, 8,156.82 and 3,898.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,912.78 : 8,156.82 = 3,898.30 : x
2. Step 2: Convert to fraction form
   5,912.78/8,156.82 = 3,898.30/x
3. Step 3: Cross multiply
   5,912.78x = 8,156.82 × 3,898.30
4. Step 4: Simplify right side
   5,912.78x = 31,797,731.41
5. Step 5: Solve for x
   x = 31,797,731.41/5,912.78
6. Step 6: Final answer
   x = 5,377.80