Finding the Fourth Proportional to 1,445.90, 1,995.59 and 856.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.90 : 1,995.59 = 856.76 : x
2. Step 2: Convert to fraction form
   1,445.90/1,995.59 = 856.76/x
3. Step 3: Cross multiply
   1,445.90x = 1,995.59 × 856.76
4. Step 4: Simplify right side
   1,445.90x = 1,709,737.40
5. Step 5: Solve for x
   x = 1,709,737.40/1,445.90
6. Step 6: Final answer
   x = 1,182.47