Finding the Fourth Proportional to 6,991.59, 9,648.32 and 3,847.71

Step by Step Solution

1. Step 1: Write the proportion equation
   6,991.59 : 9,648.32 = 3,847.71 : x
2. Step 2: Convert to fraction form
   6,991.59/9,648.32 = 3,847.71/x
3. Step 3: Cross multiply
   6,991.59x = 9,648.32 × 3,847.71
4. Step 4: Simplify right side
   6,991.59x = 37,123,918.11
5. Step 5: Solve for x
   x = 37,123,918.11/6,991.59
6. Step 6: Final answer
   x = 5,309.80