Finding the Fourth Proportional to 21,580.89, 29,781.27 and 12,020.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,580.89 : 29,781.27 = 12,020.52 : x
2. Step 2: Convert to fraction form
   21,580.89/29,781.27 = 12,020.52/x
3. Step 3: Cross multiply
   21,580.89x = 29,781.27 × 12,020.52
4. Step 4: Simplify right side
   21,580.89x = 357,986,351.66
5. Step 5: Solve for x
   x = 357,986,351.66/21,580.89
6. Step 6: Final answer
   x = 16,588.12