Finding the Fourth Proportional to 12,667.30, 17,485.81 and 11,338.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,667.30 : 17,485.81 = 11,338.70 : x
2. Step 2: Convert to fraction form
   12,667.30/17,485.81 = 11,338.70/x
3. Step 3: Cross multiply
   12,667.30x = 17,485.81 × 11,338.70
4. Step 4: Simplify right side
   12,667.30x = 198,266,336.43
5. Step 5: Solve for x
   x = 198,266,336.43/12,667.30
6. Step 6: Final answer
   x = 15,651.82