Finding the Fourth Proportional to 1,635.59, 2,456.38 and 856.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,635.59 : 2,456.38 = 856.12 : x
2. Step 2: Convert to fraction form
   1,635.59/2,456.38 = 856.12/x
3. Step 3: Cross multiply
   1,635.59x = 2,456.38 × 856.12
4. Step 4: Simplify right side
   1,635.59x = 2,102,950.76
5. Step 5: Solve for x
   x = 2,102,950.76/1,635.59
6. Step 6: Final answer
   x = 1,285.74