Finding the Fourth Proportional to 12,900.66, 17,686.97 and 12,667.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.66 : 17,686.97 = 12,667.38 : x
2. Step 2: Convert to fraction form
   12,900.66/17,686.97 = 12,667.38/x
3. Step 3: Cross multiply
   12,900.66x = 17,686.97 × 12,667.38
4. Step 4: Simplify right side
   12,900.66x = 224,047,506.70
5. Step 5: Solve for x
   x = 224,047,506.70/12,900.66
6. Step 6: Final answer
   x = 17,367.14