Finding the Fourth Proportional to 10,899.11, 16,338.81 and 3,971.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,899.11 : 16,338.81 = 3,971.99 : x
2. Step 2: Convert to fraction form
   10,899.11/16,338.81 = 3,971.99/x
3. Step 3: Cross multiply
   10,899.11x = 16,338.81 × 3,971.99
4. Step 4: Simplify right side
   10,899.11x = 64,897,589.93
5. Step 5: Solve for x
   x = 64,897,589.93/10,899.11
6. Step 6: Final answer
   x = 5,954.39