Finding the Fourth Proportional to 8,637.37, 12,942.78 and 5,120.38

Step by Step Solution

1. Step 1: Write the proportion equation
   8,637.37 : 12,942.78 = 5,120.38 : x
2. Step 2: Convert to fraction form
   8,637.37/12,942.78 = 5,120.38/x
3. Step 3: Cross multiply
   8,637.37x = 12,942.78 × 5,120.38
4. Step 4: Simplify right side
   8,637.37x = 66,271,951.86
5. Step 5: Solve for x
   x = 66,271,951.86/8,637.37
6. Step 6: Final answer
   x = 7,672.70