Finding the Fourth Proportional to 2,622.09, 3,940.56 and 1,980.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.09 : 3,940.56 = 1,980.57 : x
2. Step 2: Convert to fraction form
   2,622.09/3,940.56 = 1,980.57/x
3. Step 3: Cross multiply
   2,622.09x = 3,940.56 × 1,980.57
4. Step 4: Simplify right side
   2,622.09x = 7,804,554.92
5. Step 5: Solve for x
   x = 7,804,554.92/2,622.09
6. Step 6: Final answer
   x = 2,976.46