Finding the Fourth Proportional to 12,945.55, 17,851.58 and 9,167.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.55 : 17,851.58 = 9,167.71 : x
2. Step 2: Convert to fraction form
   12,945.55/17,851.58 = 9,167.71/x
3. Step 3: Cross multiply
   12,945.55x = 17,851.58 × 9,167.71
4. Step 4: Simplify right side
   12,945.55x = 163,658,062.64
5. Step 5: Solve for x
   x = 163,658,062.64/12,945.55
6. Step 6: Final answer
   x = 12,642.03