Finding the Fourth Proportional to 6,418.31, 8,854.63 and 3,900.01

Step by Step Solution

1. Step 1: Write the proportion equation
   6,418.31 : 8,854.63 = 3,900.01 : x
2. Step 2: Convert to fraction form
   6,418.31/8,854.63 = 3,900.01/x
3. Step 3: Cross multiply
   6,418.31x = 8,854.63 × 3,900.01
4. Step 4: Simplify right side
   6,418.31x = 34,533,145.55
5. Step 5: Solve for x
   x = 34,533,145.55/6,418.31
6. Step 6: Final answer
   x = 5,380.41