Finding the Fourth Proportional to 2,238.42, 3,357.37 and 678.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,238.42 : 3,357.37 = 678.07 : x
2. Step 2: Convert to fraction form
   2,238.42/3,357.37 = 678.07/x
3. Step 3: Cross multiply
   2,238.42x = 3,357.37 × 678.07
4. Step 4: Simplify right side
   2,238.42x = 2,276,531.88
5. Step 5: Solve for x
   x = 2,276,531.88/2,238.42
6. Step 6: Final answer
   x = 1,017.03