Finding the Fourth Proportional to 13,142.56, 18,136.26 and 7,174.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.56 : 18,136.26 = 7,174.12 : x
2. Step 2: Convert to fraction form
   13,142.56/18,136.26 = 7,174.12/x
3. Step 3: Cross multiply
   13,142.56x = 18,136.26 × 7,174.12
4. Step 4: Simplify right side
   13,142.56x = 130,111,705.59
5. Step 5: Solve for x
   x = 130,111,705.59/13,142.56
6. Step 6: Final answer
   x = 9,900.03