Finding the Fourth Proportional to 12,478.05, 18,698.58 and 5,451.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,478.05 : 18,698.58 = 5,451.57 : x
2. Step 2: Convert to fraction form
   12,478.05/18,698.58 = 5,451.57/x
3. Step 3: Cross multiply
   12,478.05x = 18,698.58 × 5,451.57
4. Step 4: Simplify right side
   12,478.05x = 101,936,617.77
5. Step 5: Solve for x
   x = 101,936,617.77/12,478.05
6. Step 6: Final answer
   x = 8,169.27