Finding the Fourth Proportional to 2,620.72, 3,931.22 and 672.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.72 : 3,931.22 = 672.94 : x
2. Step 2: Convert to fraction form
   2,620.72/3,931.22 = 672.94/x
3. Step 3: Cross multiply
   2,620.72x = 3,931.22 × 672.94
4. Step 4: Simplify right side
   2,620.72x = 2,645,475.19
5. Step 5: Solve for x
   x = 2,645,475.19/2,620.72
6. Step 6: Final answer
   x = 1,009.45