Finding the Fourth Proportional to 22,188.40, 30,620.12 and 12,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,188.40 : 30,620.12 = 12,116.72 : x
2. Step 2: Convert to fraction form
   22,188.40/30,620.12 = 12,116.72/x
3. Step 3: Cross multiply
   22,188.40x = 30,620.12 × 12,116.72
4. Step 4: Simplify right side
   22,188.40x = 371,015,420.41
5. Step 5: Solve for x
   x = 371,015,420.41/22,188.40
6. Step 6: Final answer
   x = 16,721.14