Finding the Fourth Proportional to 1,375.98, 2,064.98 and 856.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.98 : 2,064.98 = 856.73 : x
2. Step 2: Convert to fraction form
   1,375.98/2,064.98 = 856.73/x
3. Step 3: Cross multiply
   1,375.98x = 2,064.98 × 856.73
4. Step 4: Simplify right side
   1,375.98x = 1,769,130.32
5. Step 5: Solve for x
   x = 1,769,130.32/1,375.98
6. Step 6: Final answer
   x = 1,285.72