Finding the Fourth Proportional to 9,689.32, 13,376.24 and 5,711.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,689.32 : 13,376.24 = 5,711.72 : x
2. Step 2: Convert to fraction form
   9,689.32/13,376.24 = 5,711.72/x
3. Step 3: Cross multiply
   9,689.32x = 13,376.24 × 5,711.72
4. Step 4: Simplify right side
   9,689.32x = 76,401,263.51
5. Step 5: Solve for x
   x = 76,401,263.51/9,689.32
6. Step 6: Final answer
   x = 7,885.10