Finding the Fourth Proportional to 1,087.56, 1,632.15 and 873.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.56 : 1,632.15 = 873.72 : x
2. Step 2: Convert to fraction form
   1,087.56/1,632.15 = 873.72/x
3. Step 3: Cross multiply
   1,087.56x = 1,632.15 × 873.72
4. Step 4: Simplify right side
   1,087.56x = 1,426,042.10
5. Step 5: Solve for x
   x = 1,426,042.10/1,087.56
6. Step 6: Final answer
   x = 1,311.23