Finding the Fourth Proportional to 8,412.37, 12,604.61 and 5,115.49

Step by Step Solution

1. Step 1: Write the proportion equation
   8,412.37 : 12,604.61 = 5,115.49 : x
2. Step 2: Convert to fraction form
   8,412.37/12,604.61 = 5,115.49/x
3. Step 3: Cross multiply
   8,412.37x = 12,604.61 × 5,115.49
4. Step 4: Simplify right side
   8,412.37x = 64,478,730.83
5. Step 5: Solve for x
   x = 64,478,730.83/8,412.37
6. Step 6: Final answer
   x = 7,664.75