Finding the Fourth Proportional to 1,062.23, 1,591.98 and 856.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,062.23 : 1,591.98 = 856.89 : x
2. Step 2: Convert to fraction form
   1,062.23/1,591.98 = 856.89/x
3. Step 3: Cross multiply
   1,062.23x = 1,591.98 × 856.89
4. Step 4: Simplify right side
   1,062.23x = 1,364,151.74
5. Step 5: Solve for x
   x = 1,364,151.74/1,062.23
6. Step 6: Final answer
   x = 1,284.24