Finding the Fourth Proportional to 2,421.69, 3,637.39 and 2,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.69 : 3,637.39 = 2,116.72 : x
2. Step 2: Convert to fraction form
   2,421.69/3,637.39 = 2,116.72/x
3. Step 3: Cross multiply
   2,421.69x = 3,637.39 × 2,116.72
4. Step 4: Simplify right side
   2,421.69x = 7,699,336.16
5. Step 5: Solve for x
   x = 7,699,336.16/2,421.69
6. Step 6: Final answer
   x = 3,179.32