Finding the Fourth Proportional to 12,144.75, 18,219.60 and 5,124.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,144.75 : 18,219.60 = 5,124.76 : x
2. Step 2: Convert to fraction form
   12,144.75/18,219.60 = 5,124.76/x
3. Step 3: Cross multiply
   12,144.75x = 18,219.60 × 5,124.76
4. Step 4: Simplify right side
   12,144.75x = 93,371,064.48
5. Step 5: Solve for x
   x = 93,371,064.48/12,144.75
6. Step 6: Final answer
   x = 7,688.19