Finding the Fourth Proportional to 13,142.19, 18,136.33 and 7,173.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.19 : 18,136.33 = 7,173.98 : x
2. Step 2: Convert to fraction form
   13,142.19/18,136.33 = 7,173.98/x
3. Step 3: Cross multiply
   13,142.19x = 18,136.33 × 7,173.98
4. Step 4: Simplify right side
   13,142.19x = 130,109,668.69
5. Step 5: Solve for x
   x = 130,109,668.69/13,142.19
6. Step 6: Final answer
   x = 9,900.15