Finding the Fourth Proportional to 9,731.50, 13,429.79 and 5,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,731.50 : 13,429.79 = 5,315.50 : x
2. Step 2: Convert to fraction form
   9,731.50/13,429.79 = 5,315.50/x
3. Step 3: Cross multiply
   9,731.50x = 13,429.79 × 5,315.50
4. Step 4: Simplify right side
   9,731.50x = 71,386,048.75
5. Step 5: Solve for x
   x = 71,386,048.75/9,731.50
6. Step 6: Final answer
   x = 7,335.56