Finding the Fourth Proportional to 6,991.59, 9,648.71 and 4,339.86

Step by Step Solution

1. Step 1: Write the proportion equation
   6,991.59 : 9,648.71 = 4,339.86 : x
2. Step 2: Convert to fraction form
   6,991.59/9,648.71 = 4,339.86/x
3. Step 3: Cross multiply
   6,991.59x = 9,648.71 × 4,339.86
4. Step 4: Simplify right side
   6,991.59x = 41,874,050.58
5. Step 5: Solve for x
   x = 41,874,050.58/6,991.59
6. Step 6: Final answer
   x = 5,989.20