Finding the Fourth Proportional to 1,368.90, 1,889.39 and 871.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.90 : 1,889.39 = 871.16 : x
2. Step 2: Convert to fraction form
   1,368.90/1,889.39 = 871.16/x
3. Step 3: Cross multiply
   1,368.90x = 1,889.39 × 871.16
4. Step 4: Simplify right side
   1,368.90x = 1,645,953.72
5. Step 5: Solve for x
   x = 1,645,953.72/1,368.90
6. Step 6: Final answer
   x = 1,202.39