Finding the Fourth Proportional to 12,578.50, 18,876.39 and 4,370.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.50 : 18,876.39 = 4,370.50 : x
2. Step 2: Convert to fraction form
   12,578.50/18,876.39 = 4,370.50/x
3. Step 3: Cross multiply
   12,578.50x = 18,876.39 × 4,370.50
4. Step 4: Simplify right side
   12,578.50x = 82,499,262.50
5. Step 5: Solve for x
   x = 82,499,262.50/12,578.50
6. Step 6: Final answer
   x = 6,558.75