Finding the Fourth Proportional to 1,396.70, 1,925.34 and 871.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.70 : 1,925.34 = 871.82 : x
2. Step 2: Convert to fraction form
   1,396.70/1,925.34 = 871.82/x
3. Step 3: Cross multiply
   1,396.70x = 1,925.34 × 871.82
4. Step 4: Simplify right side
   1,396.70x = 1,678,549.92
5. Step 5: Solve for x
   x = 1,678,549.92/1,396.70
6. Step 6: Final answer
   x = 1,201.80