Finding the Fourth Proportional to 2,259.82, 3,390.23 and 678.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.82 : 3,390.23 = 678.47 : x
2. Step 2: Convert to fraction form
   2,259.82/3,390.23 = 678.47/x
3. Step 3: Cross multiply
   2,259.82x = 3,390.23 × 678.47
4. Step 4: Simplify right side
   2,259.82x = 2,300,165.96
5. Step 5: Solve for x
   x = 2,300,165.96/2,259.82
6. Step 6: Final answer
   x = 1,017.85