Finding the Fourth Proportional to 1,711.94, 2,570.12 and 890.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,711.94 : 2,570.12 = 890.78 : x
2. Step 2: Convert to fraction form
   1,711.94/2,570.12 = 890.78/x
3. Step 3: Cross multiply
   1,711.94x = 2,570.12 × 890.78
4. Step 4: Simplify right side
   1,711.94x = 2,289,411.49
5. Step 5: Solve for x
   x = 2,289,411.49/1,711.94
6. Step 6: Final answer
   x = 1,337.32