Finding the Fourth Proportional to 2,123.92, 2,930.79 and 1,284.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.92 : 2,930.79 = 1,284.76 : x
2. Step 2: Convert to fraction form
   2,123.92/2,930.79 = 1,284.76/x
3. Step 3: Cross multiply
   2,123.92x = 2,930.79 × 1,284.76
4. Step 4: Simplify right side
   2,123.92x = 3,765,361.76
5. Step 5: Solve for x
   x = 3,765,361.76/2,123.92
6. Step 6: Final answer
   x = 1,772.84