Finding the Fourth Proportional to 21,627.30, 29,845.89 and 12,680.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,627.30 : 29,845.89 = 12,680.10 : x
2. Step 2: Convert to fraction form
   21,627.30/29,845.89 = 12,680.10/x
3. Step 3: Cross multiply
   21,627.30x = 29,845.89 × 12,680.10
4. Step 4: Simplify right side
   21,627.30x = 378,448,869.79
5. Step 5: Solve for x
   x = 378,448,869.79/21,627.30
6. Step 6: Final answer
   x = 17,498.66