Finding the Fourth Proportional to 2,016.40, 2,779.88 and 1,306.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.40 : 2,779.88 = 1,306.96 : x
2. Step 2: Convert to fraction form
   2,016.40/2,779.88 = 1,306.96/x
3. Step 3: Cross multiply
   2,016.40x = 2,779.88 × 1,306.96
4. Step 4: Simplify right side
   2,016.40x = 3,633,191.96
5. Step 5: Solve for x
   x = 3,633,191.96/2,016.40
6. Step 6: Final answer
   x = 1,801.82