Finding the Fourth Proportional to 1,087.67, 1,623.62 and 956.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.67 : 1,623.62 = 956.30 : x
2. Step 2: Convert to fraction form
   1,087.67/1,623.62 = 956.30/x
3. Step 3: Cross multiply
   1,087.67x = 1,623.62 × 956.30
4. Step 4: Simplify right side
   1,087.67x = 1,552,667.81
5. Step 5: Solve for x
   x = 1,552,667.81/1,087.67
6. Step 6: Final answer
   x = 1,427.52