Finding the Fourth Proportional to 21,671.34, 29,900.43 and 13,716.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,671.34 : 29,900.43 = 13,716.96 : x
2. Step 2: Convert to fraction form
   21,671.34/29,900.43 = 13,716.96/x
3. Step 3: Cross multiply
   21,671.34x = 29,900.43 × 13,716.96
4. Step 4: Simplify right side
   21,671.34x = 410,143,002.29
5. Step 5: Solve for x
   x = 410,143,002.29/21,671.34
6. Step 6: Final answer
   x = 18,925.59