Finding the Fourth Proportional to 2,221, 3,065.34 and 1,290.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,221 : 3,065.34 = 1,290.04 : x
2. Step 2: Convert to fraction form
   2,221/3,065.34 = 1,290.04/x
3. Step 3: Cross multiply
   2,221x = 3,065.34 × 1,290.04
4. Step 4: Simplify right side
   2,221x = 3,954,411.21
5. Step 5: Solve for x
   x = 3,954,411.21/2,221
6. Step 6: Final answer
   x = 1,780.46