Finding the Fourth Proportional to 12,144.32, 18,208.94 and 5,120.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,144.32 : 18,208.94 = 5,120.72 : x
2. Step 2: Convert to fraction form
   12,144.32/18,208.94 = 5,120.72/x
3. Step 3: Cross multiply
   12,144.32x = 18,208.94 × 5,120.72
4. Step 4: Simplify right side
   12,144.32x = 93,242,883.24
5. Step 5: Solve for x
   x = 93,242,883.24/12,144.32
6. Step 6: Final answer
   x = 7,677.90