Finding the Fourth Proportional to 6,427.85, 8,870.55 and 3,910.07

Step by Step Solution

1. Step 1: Write the proportion equation
   6,427.85 : 8,870.55 = 3,910.07 : x
2. Step 2: Convert to fraction form
   6,427.85/8,870.55 = 3,910.07/x
3. Step 3: Cross multiply
   6,427.85x = 8,870.55 × 3,910.07
4. Step 4: Simplify right side
   6,427.85x = 34,684,427.09
5. Step 5: Solve for x
   x = 34,684,427.09/6,427.85
6. Step 6: Final answer
   x = 5,395.97