Finding the Fourth Proportional to 1,173.98, 1,762.25 and 864.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.98 : 1,762.25 = 864.87 : x
2. Step 2: Convert to fraction form
   1,173.98/1,762.25 = 864.87/x
3. Step 3: Cross multiply
   1,173.98x = 1,762.25 × 864.87
4. Step 4: Simplify right side
   1,173.98x = 1,524,112.83
5. Step 5: Solve for x
   x = 1,524,112.83/1,173.98
6. Step 6: Final answer
   x = 1,298.25