Finding the Fourth Proportional to 6,290.78, 8,684.52 and 4,947.23

Step by Step Solution

1. Step 1: Write the proportion equation
   6,290.78 : 8,684.52 = 4,947.23 : x
2. Step 2: Convert to fraction form
   6,290.78/8,684.52 = 4,947.23/x
3. Step 3: Cross multiply
   6,290.78x = 8,684.52 × 4,947.23
4. Step 4: Simplify right side
   6,290.78x = 42,964,274.46
5. Step 5: Solve for x
   x = 42,964,274.46/6,290.78
6. Step 6: Final answer
   x = 6,829.72