Finding the Fourth Proportional to 1,445.16, 1,994.64 and 856.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.16 : 1,994.64 = 856.06 : x
2. Step 2: Convert to fraction form
   1,445.16/1,994.64 = 856.06/x
3. Step 3: Cross multiply
   1,445.16x = 1,994.64 × 856.06
4. Step 4: Simplify right side
   1,445.16x = 1,707,531.52
5. Step 5: Solve for x
   x = 1,707,531.52/1,445.16
6. Step 6: Final answer
   x = 1,181.55