Finding the Fourth Proportional to 13,142.16, 18,136.62 and 7,174.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.16 : 18,136.62 = 7,174.18 : x
2. Step 2: Convert to fraction form
   13,142.16/18,136.62 = 7,174.18/x
3. Step 3: Cross multiply
   13,142.16x = 18,136.62 × 7,174.18
4. Step 4: Simplify right side
   13,142.16x = 130,115,376.47
5. Step 5: Solve for x
   x = 130,115,376.47/13,142.16
6. Step 6: Final answer
   x = 9,900.61