Finding the Fourth Proportional to 6,618.42, 9,912.51 and 3,158.10

Step by Step Solution

1. Step 1: Write the proportion equation
   6,618.42 : 9,912.51 = 3,158.10 : x
2. Step 2: Convert to fraction form
   6,618.42/9,912.51 = 3,158.10/x
3. Step 3: Cross multiply
   6,618.42x = 9,912.51 × 3,158.10
4. Step 4: Simplify right side
   6,618.42x = 31,304,697.83
5. Step 5: Solve for x
   x = 31,304,697.83/6,618.42
6. Step 6: Final answer
   x = 4,729.94