Finding the Fourth Proportional to 16,667.88, 22,991.07 and 12,680.28

Step by Step Solution

1. Step 1: Write the proportion equation
   16,667.88 : 22,991.07 = 12,680.28 : x
2. Step 2: Convert to fraction form
   16,667.88/22,991.07 = 12,680.28/x
3. Step 3: Cross multiply
   16,667.88x = 22,991.07 × 12,680.28
4. Step 4: Simplify right side
   16,667.88x = 291,533,205.10
5. Step 5: Solve for x
   x = 291,533,205.10/16,667.88
6. Step 6: Final answer
   x = 17,490.72