Finding the Fourth Proportional to 2,446.80, 3,663.72 and 1,290.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,446.80 : 3,663.72 = 1,290.12 : x
2. Step 2: Convert to fraction form
   2,446.80/3,663.72 = 1,290.12/x
3. Step 3: Cross multiply
   2,446.80x = 3,663.72 × 1,290.12
4. Step 4: Simplify right side
   2,446.80x = 4,726,638.45
5. Step 5: Solve for x
   x = 4,726,638.45/2,446.80
6. Step 6: Final answer
   x = 1,931.76