Finding the Fourth Proportional to 12,156.41, 18,236.55 and 5,136.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.41 : 18,236.55 = 5,136.49 : x
2. Step 2: Convert to fraction form
   12,156.41/18,236.55 = 5,136.49/x
3. Step 3: Cross multiply
   12,156.41x = 18,236.55 × 5,136.49
4. Step 4: Simplify right side
   12,156.41x = 93,671,830.38
5. Step 5: Solve for x
   x = 93,671,830.38/12,156.41
6. Step 6: Final answer
   x = 7,705.55