Finding the Fourth Proportional to 1,445.76, 1,995.57 and 856.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.76 : 1,995.57 = 856.49 : x
2. Step 2: Convert to fraction form
   1,445.76/1,995.57 = 856.49/x
3. Step 3: Cross multiply
   1,445.76x = 1,995.57 × 856.49
4. Step 4: Simplify right side
   1,445.76x = 1,709,175.77
5. Step 5: Solve for x
   x = 1,709,175.77/1,445.76
6. Step 6: Final answer
   x = 1,182.20