Finding the Fourth Proportional to 1,679.54, 2,518.16 and 800.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.54 : 2,518.16 = 800.89 : x
2. Step 2: Convert to fraction form
   1,679.54/2,518.16 = 800.89/x
3. Step 3: Cross multiply
   1,679.54x = 2,518.16 × 800.89
4. Step 4: Simplify right side
   1,679.54x = 2,016,758.86
5. Step 5: Solve for x
   x = 2,016,758.86/1,679.54
6. Step 6: Final answer
   x = 1,200.78