Finding the Fourth Proportional to 2,622.78, 3,935.70 and 980.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.78 : 3,935.70 = 980.46 : x
2. Step 2: Convert to fraction form
   2,622.78/3,935.70 = 980.46/x
3. Step 3: Cross multiply
   2,622.78x = 3,935.70 × 980.46
4. Step 4: Simplify right side
   2,622.78x = 3,858,796.42
5. Step 5: Solve for x
   x = 3,858,796.42/2,622.78
6. Step 6: Final answer
   x = 1,471.26