Finding the Fourth Proportional to 1,734.05, 2,600.78 and 856.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,734.05 : 2,600.78 = 856.31 : x
2. Step 2: Convert to fraction form
   1,734.05/2,600.78 = 856.31/x
3. Step 3: Cross multiply
   1,734.05x = 2,600.78 × 856.31
4. Step 4: Simplify right side
   1,734.05x = 2,227,056.64
5. Step 5: Solve for x
   x = 2,227,056.64/1,734.05
6. Step 6: Final answer
   x = 1,284.31