Finding the Fourth Proportional to 1,205.35, 1,662.12 and 1,072.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,205.35 : 1,662.12 = 1,072.72 : x
2. Step 2: Convert to fraction form
   1,205.35/1,662.12 = 1,072.72/x
3. Step 3: Cross multiply
   1,205.35x = 1,662.12 × 1,072.72
4. Step 4: Simplify right side
   1,205.35x = 1,782,989.37
5. Step 5: Solve for x
   x = 1,782,989.37/1,205.35
6. Step 6: Final answer
   x = 1,479.23