Finding the Fourth Proportional to 2,783.56, 4,171.86 and 1,319.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,783.56 : 4,171.86 = 1,319.80 : x
2. Step 2: Convert to fraction form
   2,783.56/4,171.86 = 1,319.80/x
3. Step 3: Cross multiply
   2,783.56x = 4,171.86 × 1,319.80
4. Step 4: Simplify right side
   2,783.56x = 5,506,020.83
5. Step 5: Solve for x
   x = 5,506,020.83/2,783.56
6. Step 6: Final answer
   x = 1,978.05