Finding the Fourth Proportional to 13,642.12, 18,823.89 and 9,173.35

Step by Step Solution

1. Step 1: Write the proportion equation
   13,642.12 : 18,823.89 = 9,173.35 : x
2. Step 2: Convert to fraction form
   13,642.12/18,823.89 = 9,173.35/x
3. Step 3: Cross multiply
   13,642.12x = 18,823.89 × 9,173.35
4. Step 4: Simplify right side
   13,642.12x = 172,678,131.33
5. Step 5: Solve for x
   x = 172,678,131.33/13,642.12
6. Step 6: Final answer
   x = 12,657.72