Finding the Fourth Proportional to 1,206.87, 1,665.25 and 709.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,206.87 : 1,665.25 = 709.53 : x
2. Step 2: Convert to fraction form
   1,206.87/1,665.25 = 709.53/x
3. Step 3: Cross multiply
   1,206.87x = 1,665.25 × 709.53
4. Step 4: Simplify right side
   1,206.87x = 1,181,544.83
5. Step 5: Solve for x
   x = 1,181,544.83/1,206.87
6. Step 6: Final answer
   x = 979.02