Finding the Fourth Proportional to 12,079.72, 18,120.12 and 3,313.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,079.72 : 18,120.12 = 3,313.45 : x
2. Step 2: Convert to fraction form
   12,079.72/18,120.12 = 3,313.45/x
3. Step 3: Cross multiply
   12,079.72x = 18,120.12 × 3,313.45
4. Step 4: Simplify right side
   12,079.72x = 60,040,111.61
5. Step 5: Solve for x
   x = 60,040,111.61/12,079.72
6. Step 6: Final answer
   x = 4,970.32