Finding the Fourth Proportional to 22,071.44, 30,457 and 12,639.76

Step by Step Solution

1. Step 1: Write the proportion equation
   22,071.44 : 30,457 = 12,639.76 : x
2. Step 2: Convert to fraction form
   22,071.44/30,457 = 12,639.76/x
3. Step 3: Cross multiply
   22,071.44x = 30,457 × 12,639.76
4. Step 4: Simplify right side
   22,071.44x = 384,969,170.32
5. Step 5: Solve for x
   x = 384,969,170.32/22,071.44
6. Step 6: Final answer
   x = 17,441.96