Finding the Fourth Proportional to 12,412.86, 18,608.81 and 5,387.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,412.86 : 18,608.81 = 5,387.58 : x
2. Step 2: Convert to fraction form
   12,412.86/18,608.81 = 5,387.58/x
3. Step 3: Cross multiply
   12,412.86x = 18,608.81 × 5,387.58
4. Step 4: Simplify right side
   12,412.86x = 100,256,392.59
5. Step 5: Solve for x
   x = 100,256,392.59/12,412.86
6. Step 6: Final answer
   x = 8,076.82