Finding the Fourth Proportional to 21,173.78, 29,240.69 and 16,690.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,173.78 : 29,240.69 = 16,690.43 : x
2. Step 2: Convert to fraction form
   21,173.78/29,240.69 = 16,690.43/x
3. Step 3: Cross multiply
   21,173.78x = 29,240.69 × 16,690.43
4. Step 4: Simplify right side
   21,173.78x = 488,039,459.94
5. Step 5: Solve for x
   x = 488,039,459.94/21,173.78
6. Step 6: Final answer
   x = 23,049.24