Finding the Fourth Proportional to 22,213.61, 30,655.60 and 12,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,213.61 : 30,655.60 = 12,142.72 : x
2. Step 2: Convert to fraction form
   22,213.61/30,655.60 = 12,142.72/x
3. Step 3: Cross multiply
   22,213.61x = 30,655.60 × 12,142.72
4. Step 4: Simplify right side
   22,213.61x = 372,242,306.52
5. Step 5: Solve for x
   x = 372,242,306.52/22,213.61
6. Step 6: Final answer
   x = 16,757.40