Finding the Fourth Proportional to 12,216.18, 18,311.52 and 5,646.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,216.18 : 18,311.52 = 5,646.70 : x
2. Step 2: Convert to fraction form
   12,216.18/18,311.52 = 5,646.70/x
3. Step 3: Cross multiply
   12,216.18x = 18,311.52 × 5,646.70
4. Step 4: Simplify right side
   12,216.18x = 103,399,659.98
5. Step 5: Solve for x
   x = 103,399,659.98/12,216.18
6. Step 6: Final answer
   x = 8,464.16