Finding the Fourth Proportional to 21,667.50, 29,901.15 and 11,731.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,667.50 : 29,901.15 = 11,731.50 : x
2. Step 2: Convert to fraction form
   21,667.50/29,901.15 = 11,731.50/x
3. Step 3: Cross multiply
   21,667.50x = 29,901.15 × 11,731.50
4. Step 4: Simplify right side
   21,667.50x = 350,785,341.23
5. Step 5: Solve for x
   x = 350,785,341.23/21,667.50
6. Step 6: Final answer
   x = 16,189.47