Finding the Fourth Proportional to 2,618.49, 3,928.49 and 1,058.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.49 : 3,928.49 = 1,058.15 : x
2. Step 2: Convert to fraction form
   2,618.49/3,928.49 = 1,058.15/x
3. Step 3: Cross multiply
   2,618.49x = 3,928.49 × 1,058.15
4. Step 4: Simplify right side
   2,618.49x = 4,156,906.76
5. Step 5: Solve for x
   x = 4,156,906.76/2,618.49
6. Step 6: Final answer
   x = 1,587.52