Finding the Fourth Proportional to 2,809.89, 4,216.65 and 1,078.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.89 : 4,216.65 = 1,078.50 : x
2. Step 2: Convert to fraction form
   2,809.89/4,216.65 = 1,078.50/x
3. Step 3: Cross multiply
   2,809.89x = 4,216.65 × 1,078.50
4. Step 4: Simplify right side
   2,809.89x = 4,547,657.03
5. Step 5: Solve for x
   x = 4,547,657.03/2,809.89
6. Step 6: Final answer
   x = 1,618.45