Finding the Fourth Proportional to 31,920.99, 47,884.72 and 12,216.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,920.99 : 47,884.72 = 12,216.12 : x
2. Step 2: Convert to fraction form
   31,920.99/47,884.72 = 12,216.12/x
3. Step 3: Cross multiply
   31,920.99x = 47,884.72 × 12,216.12
4. Step 4: Simplify right side
   31,920.99x = 584,965,215.72
5. Step 5: Solve for x
   x = 584,965,215.72/31,920.99
6. Step 6: Final answer
   x = 18,325.41