Finding the Fourth Proportional to 2,618.50, 3,929.55 and 1,079.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.50 : 3,929.55 = 1,079.50 : x
2. Step 2: Convert to fraction form
   2,618.50/3,929.55 = 1,079.50/x
3. Step 3: Cross multiply
   2,618.50x = 3,929.55 × 1,079.50
4. Step 4: Simplify right side
   2,618.50x = 4,241,949.23
5. Step 5: Solve for x
   x = 4,241,949.23/2,618.50
6. Step 6: Final answer
   x = 1,619.99