Finding the Fourth Proportional to 2,238.89, 3,358.80 and 678.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,238.89 : 3,358.80 = 678.98 : x
2. Step 2: Convert to fraction form
   2,238.89/3,358.80 = 678.98/x
3. Step 3: Cross multiply
   2,238.89x = 3,358.80 × 678.98
4. Step 4: Simplify right side
   2,238.89x = 2,280,558.02
5. Step 5: Solve for x
   x = 2,280,558.02/2,238.89
6. Step 6: Final answer
   x = 1,018.61