Finding the Fourth Proportional to 1,176.06, 1,622.40 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,176.06 : 1,622.40 = 678.72 : x
2. Step 2: Convert to fraction form
   1,176.06/1,622.40 = 678.72/x
3. Step 3: Cross multiply
   1,176.06x = 1,622.40 × 678.72
4. Step 4: Simplify right side
   1,176.06x = 1,101,155.33
5. Step 5: Solve for x
   x = 1,101,155.33/1,176.06
6. Step 6: Final answer
   x = 936.31