Finding the Fourth Proportional to 21,786.96, 30,064.58 and 12,832.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,786.96 : 30,064.58 = 12,832.72 : x
2. Step 2: Convert to fraction form
   21,786.96/30,064.58 = 12,832.72/x
3. Step 3: Cross multiply
   21,786.96x = 30,064.58 × 12,832.72
4. Step 4: Simplify right side
   21,786.96x = 385,810,337.06
5. Step 5: Solve for x
   x = 385,810,337.06/21,786.96
6. Step 6: Final answer
   x = 17,708.31