Finding the Fourth Proportional to 12,938.72, 17,836.60 and 9,150.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.72 : 17,836.60 = 9,150.08 : x
2. Step 2: Convert to fraction form
   12,938.72/17,836.60 = 9,150.08/x
3. Step 3: Cross multiply
   12,938.72x = 17,836.60 × 9,150.08
4. Step 4: Simplify right side
   12,938.72x = 163,206,316.93
5. Step 5: Solve for x
   x = 163,206,316.93/12,938.72
6. Step 6: Final answer
   x = 12,613.79