Finding the Fourth Proportional to 12,429.98, 18,644.37 and 4,638.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.98 : 18,644.37 = 4,638.19 : x
2. Step 2: Convert to fraction form
   12,429.98/18,644.37 = 4,638.19/x
3. Step 3: Cross multiply
   12,429.98x = 18,644.37 × 4,638.19
4. Step 4: Simplify right side
   12,429.98x = 86,476,066.49
5. Step 5: Solve for x
   x = 86,476,066.49/12,429.98
6. Step 6: Final answer
   x = 6,957.05