Finding the Fourth Proportional to 22,461.40, 30,996.89 and 12,390.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,461.40 : 30,996.89 = 12,390.12 : x
2. Step 2: Convert to fraction form
   22,461.40/30,996.89 = 12,390.12/x
3. Step 3: Cross multiply
   22,461.40x = 30,996.89 × 12,390.12
4. Step 4: Simplify right side
   22,461.40x = 384,055,186.73
5. Step 5: Solve for x
   x = 384,055,186.73/22,461.40
6. Step 6: Final answer
   x = 17,098.45