Finding the Fourth Proportional to 1,445.76, 1,995.17 and 856.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.76 : 1,995.17 = 856.35 : x
2. Step 2: Convert to fraction form
   1,445.76/1,995.17 = 856.35/x
3. Step 3: Cross multiply
   1,445.76x = 1,995.17 × 856.35
4. Step 4: Simplify right side
   1,445.76x = 1,708,559.55
5. Step 5: Solve for x
   x = 1,708,559.55/1,445.76
6. Step 6: Final answer
   x = 1,181.77