Finding the Fourth Proportional to 9,689.72, 13,346.35 and 7,447.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,689.72 : 13,346.35 = 7,447.31 : x
2. Step 2: Convert to fraction form
   9,689.72/13,346.35 = 7,447.31/x
3. Step 3: Cross multiply
   9,689.72x = 13,346.35 × 7,447.31
4. Step 4: Simplify right side
   9,689.72x = 99,394,405.82
5. Step 5: Solve for x
   x = 99,394,405.82/9,689.72
6. Step 6: Final answer
   x = 10,257.72