Finding the Fourth Proportional to 1,445.72, 1,994.63 and 856.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.72 : 1,994.63 = 856.17 : x
2. Step 2: Convert to fraction form
   1,445.72/1,994.63 = 856.17/x
3. Step 3: Cross multiply
   1,445.72x = 1,994.63 × 856.17
4. Step 4: Simplify right side
   1,445.72x = 1,707,738.09
5. Step 5: Solve for x
   x = 1,707,738.09/1,445.72
6. Step 6: Final answer
   x = 1,181.24