Finding the Fourth Proportional to 1,238.53, 1,709.61 and 845.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.53 : 1,709.61 = 845.27 : x
2. Step 2: Convert to fraction form
   1,238.53/1,709.61 = 845.27/x
3. Step 3: Cross multiply
   1,238.53x = 1,709.61 × 845.27
4. Step 4: Simplify right side
   1,238.53x = 1,445,082.04
5. Step 5: Solve for x
   x = 1,445,082.04/1,238.53
6. Step 6: Final answer
   x = 1,166.78