Finding the Fourth Proportional to 12,354.70, 18,528.21 and 4,456.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,354.70 : 18,528.21 = 4,456.18 : x
2. Step 2: Convert to fraction form
   12,354.70/18,528.21 = 4,456.18/x
3. Step 3: Cross multiply
   12,354.70x = 18,528.21 × 4,456.18
4. Step 4: Simplify right side
   12,354.70x = 82,565,016.56
5. Step 5: Solve for x
   x = 82,565,016.56/12,354.70
6. Step 6: Final answer
   x = 6,682.89