Finding the Fourth Proportional to 21,010.72, 28,994.88 and 12,627.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,010.72 : 28,994.88 = 12,627.36 : x
2. Step 2: Convert to fraction form
   21,010.72/28,994.88 = 12,627.36/x
3. Step 3: Cross multiply
   21,010.72x = 28,994.88 × 12,627.36
4. Step 4: Simplify right side
   21,010.72x = 366,128,787.92
5. Step 5: Solve for x
   x = 366,128,787.92/21,010.72
6. Step 6: Final answer
   x = 17,425.81