Finding the Fourth Proportional to 1,264.72, 1,896.56 and 442.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,264.72 : 1,896.56 = 442.72 : x
2. Step 2: Convert to fraction form
   1,264.72/1,896.56 = 442.72/x
3. Step 3: Cross multiply
   1,264.72x = 1,896.56 × 442.72
4. Step 4: Simplify right side
   1,264.72x = 839,645.04
5. Step 5: Solve for x
   x = 839,645.04/1,264.72
6. Step 6: Final answer
   x = 663.90