Finding the Fourth Proportional to 2,290.72, 3,431.76 and 2,200

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.72 : 3,431.76 = 2,200 : x
2. Step 2: Convert to fraction form
   2,290.72/3,431.76 = 2,200/x
3. Step 3: Cross multiply
   2,290.72x = 3,431.76 × 2,200
4. Step 4: Simplify right side
   2,290.72x = 7,549,872.00
5. Step 5: Solve for x
   x = 7,549,872.00/2,290.72
6. Step 6: Final answer
   x = 3,295.85