Finding the Fourth Proportional to 1,225.72, 1,838.56 and 445.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.72 : 1,838.56 = 445.69 : x
2. Step 2: Convert to fraction form
   1,225.72/1,838.56 = 445.69/x
3. Step 3: Cross multiply
   1,225.72x = 1,838.56 × 445.69
4. Step 4: Simplify right side
   1,225.72x = 819,427.81
5. Step 5: Solve for x
   x = 819,427.81/1,225.72
6. Step 6: Final answer
   x = 668.53