Finding the Fourth Proportional to 12,005.30, 18,005.55 and 5,765.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.30 : 18,005.55 = 5,765.30 : x
2. Step 2: Convert to fraction form
   12,005.30/18,005.55 = 5,765.30/x
3. Step 3: Cross multiply
   12,005.30x = 18,005.55 × 5,765.30
4. Step 4: Simplify right side
   12,005.30x = 103,807,397.42
5. Step 5: Solve for x
   x = 103,807,397.42/12,005.30
6. Step 6: Final answer
   x = 8,646.80