Finding the Fourth Proportional to 1,395.78, 1,926.18 and 871.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.78 : 1,926.18 = 871.71 : x
2. Step 2: Convert to fraction form
   1,395.78/1,926.18 = 871.71/x
3. Step 3: Cross multiply
   1,395.78x = 1,926.18 × 871.71
4. Step 4: Simplify right side
   1,395.78x = 1,679,070.37
5. Step 5: Solve for x
   x = 1,679,070.37/1,395.78
6. Step 6: Final answer
   x = 1,202.96