Finding the Fourth Proportional to 1,980.80, 2,964.16 and 1,287.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.80 : 2,964.16 = 1,287.04 : x
2. Step 2: Convert to fraction form
   1,980.80/2,964.16 = 1,287.04/x
3. Step 3: Cross multiply
   1,980.80x = 2,964.16 × 1,287.04
4. Step 4: Simplify right side
   1,980.80x = 3,814,992.49
5. Step 5: Solve for x
   x = 3,814,992.49/1,980.80
6. Step 6: Final answer
   x = 1,925.99