Finding the Fourth Proportional to 1,971.28, 2,956.56 and 672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.28 : 2,956.56 = 672.72 : x
2. Step 2: Convert to fraction form
   1,971.28/2,956.56 = 672.72/x
3. Step 3: Cross multiply
   1,971.28x = 2,956.56 × 672.72
4. Step 4: Simplify right side
   1,971.28x = 1,988,937.04
5. Step 5: Solve for x
   x = 1,988,937.04/1,971.28
6. Step 6: Final answer
   x = 1,008.96