Finding the Fourth Proportional to 4,885.31, 7,311.29 and 3,105.47

Step by Step Solution

1. Step 1: Write the proportion equation
   4,885.31 : 7,311.29 = 3,105.47 : x
2. Step 2: Convert to fraction form
   4,885.31/7,311.29 = 3,105.47/x
3. Step 3: Cross multiply
   4,885.31x = 7,311.29 × 3,105.47
4. Step 4: Simplify right side
   4,885.31x = 22,704,939.67
5. Step 5: Solve for x
   x = 22,704,939.67/4,885.31
6. Step 6: Final answer
   x = 4,647.60