Finding the Fourth Proportional to 1,078.21, 1,488.42 and 705.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.21 : 1,488.42 = 705.21 : x
2. Step 2: Convert to fraction form
   1,078.21/1,488.42 = 705.21/x
3. Step 3: Cross multiply
   1,078.21x = 1,488.42 × 705.21
4. Step 4: Simplify right side
   1,078.21x = 1,049,648.67
5. Step 5: Solve for x
   x = 1,049,648.67/1,078.21
6. Step 6: Final answer
   x = 973.51