Finding the Fourth Proportional to 22,395.78, 30,906.12 and 12,969.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,395.78 : 30,906.12 = 12,969.78 : x
2. Step 2: Convert to fraction form
   22,395.78/30,906.12 = 12,969.78/x
3. Step 3: Cross multiply
   22,395.78x = 30,906.12 × 12,969.78
4. Step 4: Simplify right side
   22,395.78x = 400,845,577.05
5. Step 5: Solve for x
   x = 400,845,577.05/22,395.78
6. Step 6: Final answer
   x = 17,898.26