Finding the Fourth Proportional to 12,278.39, 18,403.81 and 4,880.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,278.39 : 18,403.81 = 4,880.86 : x
2. Step 2: Convert to fraction form
   12,278.39/18,403.81 = 4,880.86/x
3. Step 3: Cross multiply
   12,278.39x = 18,403.81 × 4,880.86
4. Step 4: Simplify right side
   12,278.39x = 89,826,361.86
5. Step 5: Solve for x
   x = 89,826,361.86/12,278.39
6. Step 6: Final answer
   x = 7,315.81