Finding the Fourth Proportional to 22,139.87, 30,551.90 and 12,578.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,139.87 : 30,551.90 = 12,578.50 : x
2. Step 2: Convert to fraction form
   22,139.87/30,551.90 = 12,578.50/x
3. Step 3: Cross multiply
   22,139.87x = 30,551.90 × 12,578.50
4. Step 4: Simplify right side
   22,139.87x = 384,297,074.15
5. Step 5: Solve for x
   x = 384,297,074.15/22,139.87
6. Step 6: Final answer
   x = 17,357.70