Finding the Fourth Proportional to 1,259.10, 1,737.61 and 699.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,259.10 : 1,737.61 = 699.57 : x
2. Step 2: Convert to fraction form
   1,259.10/1,737.61 = 699.57/x
3. Step 3: Cross multiply
   1,259.10x = 1,737.61 × 699.57
4. Step 4: Simplify right side
   1,259.10x = 1,215,579.83
5. Step 5: Solve for x
   x = 1,215,579.83/1,259.10
6. Step 6: Final answer
   x = 965.44