Finding the Fourth Proportional to 12,662.66, 18,998.42 and 5,643.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,662.66 : 18,998.42 = 5,643.30 : x
2. Step 2: Convert to fraction form
   12,662.66/18,998.42 = 5,643.30/x
3. Step 3: Cross multiply
   12,662.66x = 18,998.42 × 5,643.30
4. Step 4: Simplify right side
   12,662.66x = 107,213,783.59
5. Step 5: Solve for x
   x = 107,213,783.59/12,662.66
6. Step 6: Final answer
   x = 8,466.92