Finding the Fourth Proportional to 1,079.31, 1,488.98 and 705.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.31 : 1,488.98 = 705.64 : x
2. Step 2: Convert to fraction form
   1,079.31/1,488.98 = 705.64/x
3. Step 3: Cross multiply
   1,079.31x = 1,488.98 × 705.64
4. Step 4: Simplify right side
   1,079.31x = 1,050,683.85
5. Step 5: Solve for x
   x = 1,050,683.85/1,079.31
6. Step 6: Final answer
   x = 973.48