Finding the Fourth Proportional to 3,625.94, 5,436.72 and 1,980.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,625.94 : 5,436.72 = 1,980.20 : x
2. Step 2: Convert to fraction form
   3,625.94/5,436.72 = 1,980.20/x
3. Step 3: Cross multiply
   3,625.94x = 5,436.72 × 1,980.20
4. Step 4: Simplify right side
   3,625.94x = 10,765,765.76
5. Step 5: Solve for x
   x = 10,765,765.76/3,625.94
6. Step 6: Final answer
   x = 2,969.10