Finding the Fourth Proportional to 13,142.77, 18,136.72 and 7,174.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.77 : 18,136.72 = 7,174.53 : x
2. Step 2: Convert to fraction form
   13,142.77/18,136.72 = 7,174.53/x
3. Step 3: Cross multiply
   13,142.77x = 18,136.72 × 7,174.53
4. Step 4: Simplify right side
   13,142.77x = 130,122,423.81
5. Step 5: Solve for x
   x = 130,122,423.81/13,142.77
6. Step 6: Final answer
   x = 9,900.69