Finding the Fourth Proportional to 2,123.94, 2,931.07 and 1,284.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.94 : 2,931.07 = 1,284.64 : x
2. Step 2: Convert to fraction form
   2,123.94/2,931.07 = 1,284.64/x
3. Step 3: Cross multiply
   2,123.94x = 2,931.07 × 1,284.64
4. Step 4: Simplify right side
   2,123.94x = 3,765,369.76
5. Step 5: Solve for x
   x = 3,765,369.76/2,123.94
6. Step 6: Final answer
   x = 1,772.82