Finding the Fourth Proportional to 1,206.72, 1,664.73 and 709.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,206.72 : 1,664.73 = 709.29 : x
2. Step 2: Convert to fraction form
   1,206.72/1,664.73 = 709.29/x
3. Step 3: Cross multiply
   1,206.72x = 1,664.73 × 709.29
4. Step 4: Simplify right side
   1,206.72x = 1,180,776.34
5. Step 5: Solve for x
   x = 1,180,776.34/1,206.72
6. Step 6: Final answer
   x = 978.50