Finding the Fourth Proportional to 16,870, 23,280.62 and 9,418

Step by Step Solution

1. Step 1: Write the proportion equation
   16,870 : 23,280.62 = 9,418 : x
2. Step 2: Convert to fraction form
   16,870/23,280.62 = 9,418/x
3. Step 3: Cross multiply
   16,870x = 23,280.62 × 9,418
4. Step 4: Simplify right side
   16,870x = 219,256,879.16
5. Step 5: Solve for x
   x = 219,256,879.16/16,870
6. Step 6: Final answer
   x = 12,996.85