Finding the Fourth Proportional to 6,689.72, 9,231.71 and 3,705.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,689.72 : 9,231.71 = 3,705.50 : x
2. Step 2: Convert to fraction form
   6,689.72/9,231.71 = 3,705.50/x
3. Step 3: Cross multiply
   6,689.72x = 9,231.71 × 3,705.50
4. Step 4: Simplify right side
   6,689.72x = 34,208,036.72
5. Step 5: Solve for x
   x = 34,208,036.72/6,689.72
6. Step 6: Final answer
   x = 5,113.52