Finding the Fourth Proportional to 9,631.50, 13,291.62 and 5,439.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,631.50 : 13,291.62 = 5,439.78 : x
2. Step 2: Convert to fraction form
   9,631.50/13,291.62 = 5,439.78/x
3. Step 3: Cross multiply
   9,631.50x = 13,291.62 × 5,439.78
4. Step 4: Simplify right side
   9,631.50x = 72,303,488.64
5. Step 5: Solve for x
   x = 72,303,488.64/9,631.50
6. Step 6: Final answer
   x = 7,506.98