Finding the Fourth Proportional to 12,578.34, 18,854.13 and 5,990.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,578.34 : 18,854.13 = 5,990.61 : x
2. Step 2: Convert to fraction form
   12,578.34/18,854.13 = 5,990.61/x
3. Step 3: Cross multiply
   12,578.34x = 18,854.13 × 5,990.61
4. Step 4: Simplify right side
   12,578.34x = 112,947,739.72
5. Step 5: Solve for x
   x = 112,947,739.72/12,578.34
6. Step 6: Final answer
   x = 8,979.54