Finding the Fourth Proportional to 1,175.61, 1,622.73 and 678.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,175.61 : 1,622.73 = 678.38 : x
2. Step 2: Convert to fraction form
   1,175.61/1,622.73 = 678.38/x
3. Step 3: Cross multiply
   1,175.61x = 1,622.73 × 678.38
4. Step 4: Simplify right side
   1,175.61x = 1,100,822.01
5. Step 5: Solve for x
   x = 1,100,822.01/1,175.61
6. Step 6: Final answer
   x = 936.38