Finding the Fourth Proportional to 12,429.96, 18,643.34 and 3,665.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.96 : 18,643.34 = 3,665.80 : x
2. Step 2: Convert to fraction form
   12,429.96/18,643.34 = 3,665.80/x
3. Step 3: Cross multiply
   12,429.96x = 18,643.34 × 3,665.80
4. Step 4: Simplify right side
   12,429.96x = 68,342,755.77
5. Step 5: Solve for x
   x = 68,342,755.77/12,429.96
6. Step 6: Final answer
   x = 5,498.23