Finding the Fourth Proportional to 2,290.17, 3,430.41 and 1,191.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.17 : 3,430.41 = 1,191.21 : x
2. Step 2: Convert to fraction form
   2,290.17/3,430.41 = 1,191.21/x
3. Step 3: Cross multiply
   2,290.17x = 3,430.41 × 1,191.21
4. Step 4: Simplify right side
   2,290.17x = 4,086,338.70
5. Step 5: Solve for x
   x = 4,086,338.70/2,290.17
6. Step 6: Final answer
   x = 1,784.29