Finding the Fourth Proportional to 2,211.69, 3,315.32 and 1,421.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.69 : 3,315.32 = 1,421.67 : x
2. Step 2: Convert to fraction form
   2,211.69/3,315.32 = 1,421.67/x
3. Step 3: Cross multiply
   2,211.69x = 3,315.32 × 1,421.67
4. Step 4: Simplify right side
   2,211.69x = 4,713,290.98
5. Step 5: Solve for x
   x = 4,713,290.98/2,211.69
6. Step 6: Final answer
   x = 2,131.08