Finding the Fourth Proportional to 20,407.49, 30,607.71 and 5,414.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,407.49 : 30,607.71 = 5,414.72 : x
2. Step 2: Convert to fraction form
   20,407.49/30,607.71 = 5,414.72/x
3. Step 3: Cross multiply
   20,407.49x = 30,607.71 × 5,414.72
4. Step 4: Simplify right side
   20,407.49x = 165,732,179.49
5. Step 5: Solve for x
   x = 165,732,179.49/20,407.49
6. Step 6: Final answer
   x = 8,121.14