Finding the Fourth Proportional to 9,136.49, 12,608.94 and 5,156.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,136.49 : 12,608.94 = 5,156.15 : x
2. Step 2: Convert to fraction form
   9,136.49/12,608.94 = 5,156.15/x
3. Step 3: Cross multiply
   9,136.49x = 12,608.94 × 5,156.15
4. Step 4: Simplify right side
   9,136.49x = 65,013,522.94
5. Step 5: Solve for x
   x = 65,013,522.94/9,136.49
6. Step 6: Final answer
   x = 7,115.81