Finding the Fourth Proportional to 1,061.35, 1,590.66 and 856.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.35 : 1,590.66 = 856.03 : x
2. Step 2: Convert to fraction form
   1,061.35/1,590.66 = 856.03/x
3. Step 3: Cross multiply
   1,061.35x = 1,590.66 × 856.03
4. Step 4: Simplify right side
   1,061.35x = 1,361,652.68
5. Step 5: Solve for x
   x = 1,361,652.68/1,061.35
6. Step 6: Final answer
   x = 1,282.94