Finding the Fourth Proportional to 6,365.78, 8,778.72 and 4,873.76

Step by Step Solution

1. Step 1: Write the proportion equation
   6,365.78 : 8,778.72 = 4,873.76 : x
2. Step 2: Convert to fraction form
   6,365.78/8,778.72 = 4,873.76/x
3. Step 3: Cross multiply
   6,365.78x = 8,778.72 × 4,873.76
4. Step 4: Simplify right side
   6,365.78x = 42,785,374.39
5. Step 5: Solve for x
   x = 42,785,374.39/6,365.78
6. Step 6: Final answer
   x = 6,721.15