Finding the Fourth Proportional to 22,191.72, 30,623.88 and 12,120

Step by Step Solution

1. Step 1: Write the proportion equation
   22,191.72 : 30,623.88 = 12,120 : x
2. Step 2: Convert to fraction form
   22,191.72/30,623.88 = 12,120/x
3. Step 3: Cross multiply
   22,191.72x = 30,623.88 × 12,120
4. Step 4: Simplify right side
   22,191.72x = 371,161,425.60
5. Step 5: Solve for x
   x = 371,161,425.60/22,191.72
6. Step 6: Final answer
   x = 16,725.22