Finding the Fourth Proportional to 3,138.50, 4,709.91 and 1,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,138.50 : 4,709.91 = 1,086.50 : x
2. Step 2: Convert to fraction form
   3,138.50/4,709.91 = 1,086.50/x
3. Step 3: Cross multiply
   3,138.50x = 4,709.91 × 1,086.50
4. Step 4: Simplify right side
   3,138.50x = 5,117,317.22
5. Step 5: Solve for x
   x = 5,117,317.22/3,138.50
6. Step 6: Final answer
   x = 1,630.50