Finding the Fourth Proportional to 22,461, 30,996.40 and 12,389.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,461 : 30,996.40 = 12,389.78 : x
2. Step 2: Convert to fraction form
   22,461/30,996.40 = 12,389.78/x
3. Step 3: Cross multiply
   22,461x = 30,996.40 × 12,389.78
4. Step 4: Simplify right side
   22,461x = 384,038,576.79
5. Step 5: Solve for x
   x = 384,038,576.79/22,461
6. Step 6: Final answer
   x = 17,098.02