Finding the Fourth Proportional to 1,421.65, 1,961.30 and 897.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.65 : 1,961.30 = 897.38 : x
2. Step 2: Convert to fraction form
   1,421.65/1,961.30 = 897.38/x
3. Step 3: Cross multiply
   1,421.65x = 1,961.30 × 897.38
4. Step 4: Simplify right side
   1,421.65x = 1,760,031.39
5. Step 5: Solve for x
   x = 1,760,031.39/1,421.65
6. Step 6: Final answer
   x = 1,238.02