Finding the Fourth Proportional to 13,142.33, 18,136.35 and 7,173.99

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.33 : 18,136.35 = 7,173.99 : x
2. Step 2: Convert to fraction form
   13,142.33/18,136.35 = 7,173.99/x
3. Step 3: Cross multiply
   13,142.33x = 18,136.35 × 7,173.99
4. Step 4: Simplify right side
   13,142.33x = 130,109,993.54
5. Step 5: Solve for x
   x = 130,109,993.54/13,142.33
6. Step 6: Final answer
   x = 9,900.07