Finding the Fourth Proportional to 22,385.20, 30,889.15 and 12,952

Step by Step Solution

1. Step 1: Write the proportion equation
   22,385.20 : 30,889.15 = 12,952 : x
2. Step 2: Convert to fraction form
   22,385.20/30,889.15 = 12,952/x
3. Step 3: Cross multiply
   22,385.20x = 30,889.15 × 12,952
4. Step 4: Simplify right side
   22,385.20x = 400,076,270.80
5. Step 5: Solve for x
   x = 400,076,270.80/22,385.20
6. Step 6: Final answer
   x = 17,872.36