Finding the Fourth Proportional to 6,689.76, 9,231.89 and 3,705.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,689.76 : 9,231.89 = 3,705.72 : x
2. Step 2: Convert to fraction form
   6,689.76/9,231.89 = 3,705.72/x
3. Step 3: Cross multiply
   6,689.76x = 9,231.89 × 3,705.72
4. Step 4: Simplify right side
   6,689.76x = 34,210,799.41
5. Step 5: Solve for x
   x = 34,210,799.41/6,689.76
6. Step 6: Final answer
   x = 5,113.91