Finding the Fourth Proportional to 1,115.37, 1,671.23 and 1,072.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,115.37 : 1,671.23 = 1,072.71 : x
2. Step 2: Convert to fraction form
   1,115.37/1,671.23 = 1,072.71/x
3. Step 3: Cross multiply
   1,115.37x = 1,671.23 × 1,072.71
4. Step 4: Simplify right side
   1,115.37x = 1,792,747.82
5. Step 5: Solve for x
   x = 1,792,747.82/1,115.37
6. Step 6: Final answer
   x = 1,607.31