Finding the Fourth Proportional to 30,578.61, 45,859.59 and 8,386.70

Step by Step Solution

1. Step 1: Write the proportion equation
   30,578.61 : 45,859.59 = 8,386.70 : x
2. Step 2: Convert to fraction form
   30,578.61/45,859.59 = 8,386.70/x
3. Step 3: Cross multiply
   30,578.61x = 45,859.59 × 8,386.70
4. Step 4: Simplify right side
   30,578.61x = 384,610,738.10
5. Step 5: Solve for x
   x = 384,610,738.10/30,578.61
6. Step 6: Final answer
   x = 12,577.77