Finding the Fourth Proportional to 1,321.52, 1,980.25 and 705.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.52 : 1,980.25 = 705.31 : x
2. Step 2: Convert to fraction form
   1,321.52/1,980.25 = 705.31/x
3. Step 3: Cross multiply
   1,321.52x = 1,980.25 × 705.31
4. Step 4: Simplify right side
   1,321.52x = 1,396,683.41
5. Step 5: Solve for x
   x = 1,396,683.41/1,321.52
6. Step 6: Final answer
   x = 1,056.88