Finding the Fourth Proportional to 10,971.78, 16,453.59 and 3,949.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,971.78 : 16,453.59 = 3,949.89 : x
2. Step 2: Convert to fraction form
   10,971.78/16,453.59 = 3,949.89/x
3. Step 3: Cross multiply
   10,971.78x = 16,453.59 × 3,949.89
4. Step 4: Simplify right side
   10,971.78x = 64,989,870.61
5. Step 5: Solve for x
   x = 64,989,870.61/10,971.78
6. Step 6: Final answer
   x = 5,923.37