Finding the Fourth Proportional to 6,690.89, 9,234.72 and 3,860.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,690.89 : 9,234.72 = 3,860.09 : x
2. Step 2: Convert to fraction form
   6,690.89/9,234.72 = 3,860.09/x
3. Step 3: Cross multiply
   6,690.89x = 9,234.72 × 3,860.09
4. Step 4: Simplify right side
   6,690.89x = 35,646,883.17
5. Step 5: Solve for x
   x = 35,646,883.17/6,690.89
6. Step 6: Final answer
   x = 5,327.67