Finding the Fourth Proportional to 1,276.50, 1,761.67 and 709.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.50 : 1,761.67 = 709.37 : x
2. Step 2: Convert to fraction form
   1,276.50/1,761.67 = 709.37/x
3. Step 3: Cross multiply
   1,276.50x = 1,761.67 × 709.37
4. Step 4: Simplify right side
   1,276.50x = 1,249,675.85
5. Step 5: Solve for x
   x = 1,249,675.85/1,276.50
6. Step 6: Final answer
   x = 978.99