Finding the Fourth Proportional to 22,086.21, 30,479.78 and 12,656.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,086.21 : 30,479.78 = 12,656.60 : x
2. Step 2: Convert to fraction form
   22,086.21/30,479.78 = 12,656.60/x
3. Step 3: Cross multiply
   22,086.21x = 30,479.78 × 12,656.60
4. Step 4: Simplify right side
   22,086.21x = 385,770,383.55
5. Step 5: Solve for x
   x = 385,770,383.55/22,086.21
6. Step 6: Final answer
   x = 17,466.57