Finding the Fourth Proportional to 2,936.72, 4,405.29 and 856.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,936.72 : 4,405.29 = 856.74 : x
2. Step 2: Convert to fraction form
   2,936.72/4,405.29 = 856.74/x
3. Step 3: Cross multiply
   2,936.72x = 4,405.29 × 856.74
4. Step 4: Simplify right side
   2,936.72x = 3,774,201.46
5. Step 5: Solve for x
   x = 3,774,201.46/2,936.72
6. Step 6: Final answer
   x = 1,285.17