Finding the Fourth Proportional to 12,212.45, 18,320.00 and 3,890.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,212.45 : 18,320.00 = 3,890.51 : x
2. Step 2: Convert to fraction form
   12,212.45/18,320.00 = 3,890.51/x
3. Step 3: Cross multiply
   12,212.45x = 18,320.00 × 3,890.51
4. Step 4: Simplify right side
   12,212.45x = 71,274,032.15
5. Step 5: Solve for x
   x = 71,274,032.15/12,212.45
6. Step 6: Final answer
   x = 5,836.18