Finding the Fourth Proportional to 21,905.55, 30,229.78 and 12,345.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,905.55 : 30,229.78 = 12,345.59 : x
2. Step 2: Convert to fraction form
   21,905.55/30,229.78 = 12,345.59/x
3. Step 3: Cross multiply
   21,905.55x = 30,229.78 × 12,345.59
4. Step 4: Simplify right side
   21,905.55x = 373,204,469.67
5. Step 5: Solve for x
   x = 373,204,469.67/21,905.55
6. Step 6: Final answer
   x = 17,036.98