Finding the Fourth Proportional to 2,649.57, 3,976.34 and 985.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,649.57 : 3,976.34 = 985.23 : x
2. Step 2: Convert to fraction form
   2,649.57/3,976.34 = 985.23/x
3. Step 3: Cross multiply
   2,649.57x = 3,976.34 × 985.23
4. Step 4: Simplify right side
   2,649.57x = 3,917,604.53
5. Step 5: Solve for x
   x = 3,917,604.53/2,649.57
6. Step 6: Final answer
   x = 1,478.58