Finding the Fourth Proportional to 6,339.72, 8,751.86 and 4,218.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,339.72 : 8,751.86 = 4,218.78 : x
2. Step 2: Convert to fraction form
   6,339.72/8,751.86 = 4,218.78/x
3. Step 3: Cross multiply
   6,339.72x = 8,751.86 × 4,218.78
4. Step 4: Simplify right side
   6,339.72x = 36,922,223.21
5. Step 5: Solve for x
   x = 36,922,223.21/6,339.72
6. Step 6: Final answer
   x = 5,823.95