Finding the Fourth Proportional to 6,109.85, 8,431.78 and 3,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.85 : 8,431.78 = 3,591.50 : x
2. Step 2: Convert to fraction form
   6,109.85/8,431.78 = 3,591.50/x
3. Step 3: Cross multiply
   6,109.85x = 8,431.78 × 3,591.50
4. Step 4: Simplify right side
   6,109.85x = 30,282,717.18
5. Step 5: Solve for x
   x = 30,282,717.18/6,109.85
6. Step 6: Final answer
   x = 4,956.38