Finding the Fourth Proportional to 21,064.11, 31,571.86 and 7,908.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.11 : 31,571.86 = 7,908.09 : x
2. Step 2: Convert to fraction form
   21,064.11/31,571.86 = 7,908.09/x
3. Step 3: Cross multiply
   21,064.11x = 31,571.86 × 7,908.09
4. Step 4: Simplify right side
   21,064.11x = 249,672,932.72
5. Step 5: Solve for x
   x = 249,672,932.72/21,064.11
6. Step 6: Final answer
   x = 11,853.00