Finding the Fourth Proportional to 1,445.67, 1,995.10 and 856.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.67 : 1,995.10 = 856.31 : x
2. Step 2: Convert to fraction form
   1,445.67/1,995.10 = 856.31/x
3. Step 3: Cross multiply
   1,445.67x = 1,995.10 × 856.31
4. Step 4: Simplify right side
   1,445.67x = 1,708,411.96
5. Step 5: Solve for x
   x = 1,708,411.96/1,445.67
6. Step 6: Final answer
   x = 1,181.74