Finding the Fourth Proportional to 12,380.78, 18,572.38 and 3,615.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.78 : 18,572.38 = 3,615.77 : x
2. Step 2: Convert to fraction form
   12,380.78/18,572.38 = 3,615.77/x
3. Step 3: Cross multiply
   12,380.78x = 18,572.38 × 3,615.77
4. Step 4: Simplify right side
   12,380.78x = 67,153,491.82
5. Step 5: Solve for x
   x = 67,153,491.82/12,380.78
6. Step 6: Final answer
   x = 5,424.01