Finding the Fourth Proportional to 22,216, 30,658.40 and 12,280

Step by Step Solution

1. Step 1: Write the proportion equation
   22,216 : 30,658.40 = 12,280 : x
2. Step 2: Convert to fraction form
   22,216/30,658.40 = 12,280/x
3. Step 3: Cross multiply
   22,216x = 30,658.40 × 12,280
4. Step 4: Simplify right side
   22,216x = 376,485,152
5. Step 5: Solve for x
   x = 376,485,152/22,216
6. Step 6: Final answer
   x = 16,946.58