Finding the Fourth Proportional to 1,259.34, 1,737.89 and 699.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.34 : 1,737.89 = 699.80 : x
2. Step 2: Convert to fraction form
   1,259.34/1,737.89 = 699.80/x
3. Step 3: Cross multiply
   1,259.34x = 1,737.89 × 699.80
4. Step 4: Simplify right side
   1,259.34x = 1,216,175.42
5. Step 5: Solve for x
   x = 1,216,175.42/1,259.34
6. Step 6: Final answer
   x = 965.72