Finding the Fourth Proportional to 2,620.15, 3,930.22 and 672.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.15 : 3,930.22 = 672.35 : x
2. Step 2: Convert to fraction form
   2,620.15/3,930.22 = 672.35/x
3. Step 3: Cross multiply
   2,620.15x = 3,930.22 × 672.35
4. Step 4: Simplify right side
   2,620.15x = 2,642,483.42
5. Step 5: Solve for x
   x = 2,642,483.42/2,620.15
6. Step 6: Final answer
   x = 1,008.52