Finding the Fourth Proportional to 6,405.42, 8,840.06 and 3,888.16

Step by Step Solution

1. Step 1: Write the proportion equation
   6,405.42 : 8,840.06 = 3,888.16 : x
2. Step 2: Convert to fraction form
   6,405.42/8,840.06 = 3,888.16/x
3. Step 3: Cross multiply
   6,405.42x = 8,840.06 × 3,888.16
4. Step 4: Simplify right side
   6,405.42x = 34,371,567.69
5. Step 5: Solve for x
   x = 34,371,567.69/6,405.42
6. Step 6: Final answer
   x = 5,366.01