Finding the Fourth Proportional to 1,011.89, 1,396.74 and 871.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.89 : 1,396.74 = 871.46 : x
2. Step 2: Convert to fraction form
   1,011.89/1,396.74 = 871.46/x
3. Step 3: Cross multiply
   1,011.89x = 1,396.74 × 871.46
4. Step 4: Simplify right side
   1,011.89x = 1,217,204.56
5. Step 5: Solve for x
   x = 1,217,204.56/1,011.89
6. Step 6: Final answer
   x = 1,202.90