Finding the Fourth Proportional to 1,445.56, 1,994.91 and 856.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.56 : 1,994.91 = 856.10 : x
2. Step 2: Convert to fraction form
   1,445.56/1,994.91 = 856.10/x
3. Step 3: Cross multiply
   1,445.56x = 1,994.91 × 856.10
4. Step 4: Simplify right side
   1,445.56x = 1,707,849.04
5. Step 5: Solve for x
   x = 1,707,849.04/1,445.56
6. Step 6: Final answer
   x = 1,181.44