Finding the Fourth Proportional to 6,419.18, 8,855.83 and 3,900.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,419.18 : 8,855.83 = 3,900.89 : x
2. Step 2: Convert to fraction form
   6,419.18/8,855.83 = 3,900.89/x
3. Step 3: Cross multiply
   6,419.18x = 8,855.83 × 3,900.89
4. Step 4: Simplify right side
   6,419.18x = 34,545,631.08
5. Step 5: Solve for x
   x = 34,545,631.08/6,419.18
6. Step 6: Final answer
   x = 5,381.62