Finding the Fourth Proportional to 21,404.71, 29,531.30 and 12,444.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404.71 : 29,531.30 = 12,444.89 : x
2. Step 2: Convert to fraction form
   21,404.71/29,531.30 = 12,444.89/x
3. Step 3: Cross multiply
   21,404.71x = 29,531.30 × 12,444.89
4. Step 4: Simplify right side
   21,404.71x = 367,513,885.00
5. Step 5: Solve for x
   x = 367,513,885.00/21,404.71
6. Step 6: Final answer
   x = 17,169.77