Finding the Fourth Proportional to 1,175.72, 1,622.55 and 678.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,175.72 : 1,622.55 = 678.43 : x
2. Step 2: Convert to fraction form
   1,175.72/1,622.55 = 678.43/x
3. Step 3: Cross multiply
   1,175.72x = 1,622.55 × 678.43
4. Step 4: Simplify right side
   1,175.72x = 1,100,786.60
5. Step 5: Solve for x
   x = 1,100,786.60/1,175.72
6. Step 6: Final answer
   x = 936.27