Finding the Fourth Proportional to 8,390.77, 12,591.83 and 3,196.51

Step by Step Solution

1. Step 1: Write the proportion equation
   8,390.77 : 12,591.83 = 3,196.51 : x
2. Step 2: Convert to fraction form
   8,390.77/12,591.83 = 3,196.51/x
3. Step 3: Cross multiply
   8,390.77x = 12,591.83 × 3,196.51
4. Step 4: Simplify right side
   8,390.77x = 40,249,910.51
5. Step 5: Solve for x
   x = 40,249,910.51/8,390.77
6. Step 6: Final answer
   x = 4,796.93