Finding the Fourth Proportional to 21,662.79, 29,893.58 and 12,100.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,662.79 : 29,893.58 = 12,100.78 : x
2. Step 2: Convert to fraction form
   21,662.79/29,893.58 = 12,100.78/x
3. Step 3: Cross multiply
   21,662.79x = 29,893.58 × 12,100.78
4. Step 4: Simplify right side
   21,662.79x = 361,735,514.88
5. Step 5: Solve for x
   x = 361,735,514.88/21,662.79
6. Step 6: Final answer
   x = 16,698.47