Finding the Fourth Proportional to 1,395.23, 2,087.98 and 956.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.23 : 2,087.98 = 956.61 : x
2. Step 2: Convert to fraction form
   1,395.23/2,087.98 = 956.61/x
3. Step 3: Cross multiply
   1,395.23x = 2,087.98 × 956.61
4. Step 4: Simplify right side
   1,395.23x = 1,997,380.16
5. Step 5: Solve for x
   x = 1,997,380.16/1,395.23
6. Step 6: Final answer
   x = 1,431.58