Finding the Fourth Proportional to 1,067.12, 1,472.72 and 647.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,067.12 : 1,472.72 = 647.56 : x
2. Step 2: Convert to fraction form
   1,067.12/1,472.72 = 647.56/x
3. Step 3: Cross multiply
   1,067.12x = 1,472.72 × 647.56
4. Step 4: Simplify right side
   1,067.12x = 953,674.56
5. Step 5: Solve for x
   x = 953,674.56/1,067.12
6. Step 6: Final answer
   x = 893.69