Finding the Fourth Proportional to 2,931.34, 4,396.88 and 851.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.34 : 4,396.88 = 851.30 : x
2. Step 2: Convert to fraction form
   2,931.34/4,396.88 = 851.30/x
3. Step 3: Cross multiply
   2,931.34x = 4,396.88 × 851.30
4. Step 4: Simplify right side
   2,931.34x = 3,743,060.58
5. Step 5: Solve for x
   x = 3,743,060.58/2,931.34
6. Step 6: Final answer
   x = 1,276.91