Finding the Fourth Proportional to 21,351.55, 29,462.89 and 12,397.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,351.55 : 29,462.89 = 12,397.30 : x
2. Step 2: Convert to fraction form
   21,351.55/29,462.89 = 12,397.30/x
3. Step 3: Cross multiply
   21,351.55x = 29,462.89 × 12,397.30
4. Step 4: Simplify right side
   21,351.55x = 365,260,076.90
5. Step 5: Solve for x
   x = 365,260,076.90/21,351.55
6. Step 6: Final answer
   x = 17,106.96