Finding the Fourth Proportional to 1,078.67, 1,488.17 and 705.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.67 : 1,488.17 = 705.86 : x
2. Step 2: Convert to fraction form
   1,078.67/1,488.17 = 705.86/x
3. Step 3: Cross multiply
   1,078.67x = 1,488.17 × 705.86
4. Step 4: Simplify right side
   1,078.67x = 1,050,439.68
5. Step 5: Solve for x
   x = 1,050,439.68/1,078.67
6. Step 6: Final answer
   x = 973.83