Finding the Fourth Proportional to 2,058.15, 3,086.63 and 671.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058.15 : 3,086.63 = 671.60 : x
2. Step 2: Convert to fraction form
   2,058.15/3,086.63 = 671.60/x
3. Step 3: Cross multiply
   2,058.15x = 3,086.63 × 671.60
4. Step 4: Simplify right side
   2,058.15x = 2,072,980.71
5. Step 5: Solve for x
   x = 2,072,980.71/2,058.15
6. Step 6: Final answer
   x = 1,007.21