Finding the Fourth Proportional to 2,133.90, 2,945.34 and 1,912.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,133.90 : 2,945.34 = 1,912.46 : x
2. Step 2: Convert to fraction form
   2,133.90/2,945.34 = 1,912.46/x
3. Step 3: Cross multiply
   2,133.90x = 2,945.34 × 1,912.46
4. Step 4: Simplify right side
   2,133.90x = 5,632,830.21
5. Step 5: Solve for x
   x = 5,632,830.21/2,133.90
6. Step 6: Final answer
   x = 2,639.69