Finding the Fourth Proportional to 2,606.56, 3,908.86 and 851.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.56 : 3,908.86 = 851.15 : x
2. Step 2: Convert to fraction form
   2,606.56/3,908.86 = 851.15/x
3. Step 3: Cross multiply
   2,606.56x = 3,908.86 × 851.15
4. Step 4: Simplify right side
   2,606.56x = 3,327,026.19
5. Step 5: Solve for x
   x = 3,327,026.19/2,606.56
6. Step 6: Final answer
   x = 1,276.40