Finding the Fourth Proportional to 21,667.42, 29,913.93 and 13,716.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,667.42 : 29,913.93 = 13,716.46 : x
2. Step 2: Convert to fraction form
   21,667.42/29,913.93 = 13,716.46/x
3. Step 3: Cross multiply
   21,667.42x = 29,913.93 × 13,716.46
4. Step 4: Simplify right side
   21,667.42x = 410,313,224.29
5. Step 5: Solve for x
   x = 410,313,224.29/21,667.42
6. Step 6: Final answer
   x = 18,936.88