Finding the Fourth Proportional to 22,298.19, 30,766.69 and 12,861.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,298.19 : 30,766.69 = 12,861.28 : x
2. Step 2: Convert to fraction form
   22,298.19/30,766.69 = 12,861.28/x
3. Step 3: Cross multiply
   22,298.19x = 30,766.69 × 12,861.28
4. Step 4: Simplify right side
   22,298.19x = 395,698,996.95
5. Step 5: Solve for x
   x = 395,698,996.95/22,298.19
6. Step 6: Final answer
   x = 17,745.79