Finding the Fourth Proportional to 2,089.10, 3,134.30 and 856.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.10 : 3,134.30 = 856.61 : x
2. Step 2: Convert to fraction form
   2,089.10/3,134.30 = 856.61/x
3. Step 3: Cross multiply
   2,089.10x = 3,134.30 × 856.61
4. Step 4: Simplify right side
   2,089.10x = 2,684,852.77
5. Step 5: Solve for x
   x = 2,684,852.77/2,089.10
6. Step 6: Final answer
   x = 1,285.17