Finding the Fourth Proportional to 1,445.21, 1,994.72 and 856.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.21 : 1,994.72 = 856.14 : x
2. Step 2: Convert to fraction form
   1,445.21/1,994.72 = 856.14/x
3. Step 3: Cross multiply
   1,445.21x = 1,994.72 × 856.14
4. Step 4: Simplify right side
   1,445.21x = 1,707,755.30
5. Step 5: Solve for x
   x = 1,707,755.30/1,445.21
6. Step 6: Final answer
   x = 1,181.67