Finding the Fourth Proportional to 21,761.96, 30,029.12 and 12,812.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,761.96 : 30,029.12 = 12,812.28 : x
2. Step 2: Convert to fraction form
   21,761.96/30,029.12 = 12,812.28/x
3. Step 3: Cross multiply
   21,761.96x = 30,029.12 × 12,812.28
4. Step 4: Simplify right side
   21,761.96x = 384,741,493.59
5. Step 5: Solve for x
   x = 384,741,493.59/21,761.96
6. Step 6: Final answer
   x = 17,679.54