Finding the Fourth Proportional to 21,105.06, 29,126.34 and 12,152.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.06 : 29,126.34 = 12,152.40 : x
2. Step 2: Convert to fraction form
   21,105.06/29,126.34 = 12,152.40/x
3. Step 3: Cross multiply
   21,105.06x = 29,126.34 × 12,152.40
4. Step 4: Simplify right side
   21,105.06x = 353,954,934.22
5. Step 5: Solve for x
   x = 353,954,934.22/21,105.06
6. Step 6: Final answer
   x = 16,771.09