Finding the Fourth Proportional to 6,280.32, 8,662.56 and 3,921.60

Step by Step Solution

1. Step 1: Write the proportion equation
   6,280.32 : 8,662.56 = 3,921.60 : x
2. Step 2: Convert to fraction form
   6,280.32/8,662.56 = 3,921.60/x
3. Step 3: Cross multiply
   6,280.32x = 8,662.56 × 3,921.60
4. Step 4: Simplify right side
   6,280.32x = 33,971,095.30
5. Step 5: Solve for x
   x = 33,971,095.30/6,280.32
6. Step 6: Final answer
   x = 5,409.13