Finding the Fourth Proportional to 2,780.55, 4,171.64 and 1,317.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.55 : 4,171.64 = 1,317.69 : x
2. Step 2: Convert to fraction form
   2,780.55/4,171.64 = 1,317.69/x
3. Step 3: Cross multiply
   2,780.55x = 4,171.64 × 1,317.69
4. Step 4: Simplify right side
   2,780.55x = 5,496,921.72
5. Step 5: Solve for x
   x = 5,496,921.72/2,780.55
6. Step 6: Final answer
   x = 1,976.92