Finding the Fourth Proportional to 6,276.56, 8,661.72 and 3,920.07

Step by Step Solution

1. Step 1: Write the proportion equation
   6,276.56 : 8,661.72 = 3,920.07 : x
2. Step 2: Convert to fraction form
   6,276.56/8,661.72 = 3,920.07/x
3. Step 3: Cross multiply
   6,276.56x = 8,661.72 × 3,920.07
4. Step 4: Simplify right side
   6,276.56x = 33,954,548.72
5. Step 5: Solve for x
   x = 33,954,548.72/6,276.56
6. Step 6: Final answer
   x = 5,409.74