Finding the Fourth Proportional to 12,429.12, 18,643.58 and 3,663.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.12 : 18,643.58 = 3,663.91 : x
2. Step 2: Convert to fraction form
   12,429.12/18,643.58 = 3,663.91/x
3. Step 3: Cross multiply
   12,429.12x = 18,643.58 × 3,663.91
4. Step 4: Simplify right side
   12,429.12x = 68,308,399.20
5. Step 5: Solve for x
   x = 68,308,399.20/12,429.12
6. Step 6: Final answer
   x = 5,495.84