Finding the Fourth Proportional to 12,151.88, 18,213.60 and 5,578.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,151.88 : 18,213.60 = 5,578.70 : x
2. Step 2: Convert to fraction form
   12,151.88/18,213.60 = 5,578.70/x
3. Step 3: Cross multiply
   12,151.88x = 18,213.60 × 5,578.70
4. Step 4: Simplify right side
   12,151.88x = 101,608,210.32
5. Step 5: Solve for x
   x = 101,608,210.32/12,151.88
6. Step 6: Final answer
   x = 8,361.52