Finding the Fourth Proportional to 2,612.72, 3,920.62 and 970.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.72 : 3,920.62 = 970.42 : x
2. Step 2: Convert to fraction form
   2,612.72/3,920.62 = 970.42/x
3. Step 3: Cross multiply
   2,612.72x = 3,920.62 × 970.42
4. Step 4: Simplify right side
   2,612.72x = 3,804,648.06
5. Step 5: Solve for x
   x = 3,804,648.06/2,612.72
6. Step 6: Final answer
   x = 1,456.20