Finding the Fourth Proportional to 21,064.56, 31,584.78 and 16,912.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.56 : 31,584.78 = 16,912.23 : x
2. Step 2: Convert to fraction form
   21,064.56/31,584.78 = 16,912.23/x
3. Step 3: Cross multiply
   21,064.56x = 31,584.78 × 16,912.23
4. Step 4: Simplify right side
   21,064.56x = 534,169,063.86
5. Step 5: Solve for x
   x = 534,169,063.86/21,064.56
6. Step 6: Final answer
   x = 25,358.66