Finding the Fourth Proportional to 19,429.10, 29,165.55 and 12,868.10

Step by Step Solution

1. Step 1: Write the proportion equation
   19,429.10 : 29,165.55 = 12,868.10 : x
2. Step 2: Convert to fraction form
   19,429.10/29,165.55 = 12,868.10/x
3. Step 3: Cross multiply
   19,429.10x = 29,165.55 × 12,868.10
4. Step 4: Simplify right side
   19,429.10x = 375,305,213.96
5. Step 5: Solve for x
   x = 375,305,213.96/19,429.10
6. Step 6: Final answer
   x = 19,316.65