Finding the Fourth Proportional to 1,211.76, 1,672.83 and 897.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.76 : 1,672.83 = 897.84 : x
2. Step 2: Convert to fraction form
   1,211.76/1,672.83 = 897.84/x
3. Step 3: Cross multiply
   1,211.76x = 1,672.83 × 897.84
4. Step 4: Simplify right side
   1,211.76x = 1,501,933.69
5. Step 5: Solve for x
   x = 1,501,933.69/1,211.76
6. Step 6: Final answer
   x = 1,239.46