Finding the Fourth Proportional to 6,615.50, 9,129.71 and 3,631.31

Step by Step Solution

1. Step 1: Write the proportion equation
   6,615.50 : 9,129.71 = 3,631.31 : x
2. Step 2: Convert to fraction form
   6,615.50/9,129.71 = 3,631.31/x
3. Step 3: Cross multiply
   6,615.50x = 9,129.71 × 3,631.31
4. Step 4: Simplify right side
   6,615.50x = 33,152,743.42
5. Step 5: Solve for x
   x = 33,152,743.42/6,615.50
6. Step 6: Final answer
   x = 5,011.38