Finding the Fourth Proportional to 1,972.42, 2,956.56 and 672.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,972.42 : 2,956.56 = 672.88 : x
2. Step 2: Convert to fraction form
   1,972.42/2,956.56 = 672.88/x
3. Step 3: Cross multiply
   1,972.42x = 2,956.56 × 672.88
4. Step 4: Simplify right side
   1,972.42x = 1,989,410.09
5. Step 5: Solve for x
   x = 1,989,410.09/1,972.42
6. Step 6: Final answer
   x = 1,008.61