Finding the Fourth Proportional to 35,909, 53,864.46 and 12,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   35,909 : 53,864.46 = 12,216.50 : x
2. Step 2: Convert to fraction form
   35,909/53,864.46 = 12,216.50/x
3. Step 3: Cross multiply
   35,909x = 53,864.46 × 12,216.50
4. Step 4: Simplify right side
   35,909x = 658,035,175.59
5. Step 5: Solve for x
   x = 658,035,175.59/35,909
6. Step 6: Final answer
   x = 18,325.08