Finding the Fourth Proportional to 2,238.52, 3,357.82 and 678.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,238.52 : 3,357.82 = 678.56 : x
2. Step 2: Convert to fraction form
   2,238.52/3,357.82 = 678.56/x
3. Step 3: Cross multiply
   2,238.52x = 3,357.82 × 678.56
4. Step 4: Simplify right side
   2,238.52x = 2,278,482.34
5. Step 5: Solve for x
   x = 2,278,482.34/2,238.52
6. Step 6: Final answer
   x = 1,017.85