Finding the Fourth Proportional to 1,428.82, 1,971.07 and 897.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.82 : 1,971.07 = 897.41 : x
2. Step 2: Convert to fraction form
   1,428.82/1,971.07 = 897.41/x
3. Step 3: Cross multiply
   1,428.82x = 1,971.07 × 897.41
4. Step 4: Simplify right side
   1,428.82x = 1,768,860.61
5. Step 5: Solve for x
   x = 1,768,860.61/1,428.82
6. Step 6: Final answer
   x = 1,237.99