Finding the Fourth Proportional to 21,787.60, 30,067.56 and 12,356.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,787.60 : 30,067.56 = 12,356.56 : x
2. Step 2: Convert to fraction form
   21,787.60/30,067.56 = 12,356.56/x
3. Step 3: Cross multiply
   21,787.60x = 30,067.56 × 12,356.56
4. Step 4: Simplify right side
   21,787.60x = 371,531,609.19
5. Step 5: Solve for x
   x = 371,531,609.19/21,787.60
6. Step 6: Final answer
   x = 17,052.43