Finding the Fourth Proportional to 1,445.26, 1,994.50 and 856.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.26 : 1,994.50 = 856.30 : x
2. Step 2: Convert to fraction form
   1,445.26/1,994.50 = 856.30/x
3. Step 3: Cross multiply
   1,445.26x = 1,994.50 × 856.30
4. Step 4: Simplify right side
   1,445.26x = 1,707,890.35
5. Step 5: Solve for x
   x = 1,707,890.35/1,445.26
6. Step 6: Final answer
   x = 1,181.72