Finding the Fourth Proportional to 12,390.72, 18,584.64 and 4,182.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.72 : 18,584.64 = 4,182.72 : x
2. Step 2: Convert to fraction form
   12,390.72/18,584.64 = 4,182.72/x
3. Step 3: Cross multiply
   12,390.72x = 18,584.64 × 4,182.72
4. Step 4: Simplify right side
   12,390.72x = 77,734,345.42
5. Step 5: Solve for x
   x = 77,734,345.42/12,390.72
6. Step 6: Final answer
   x = 6,273.59