Finding the Fourth Proportional to 2,421.78, 3,343.32 and 1,636.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,421.78 : 3,343.32 = 1,636.89 : x
2. Step 2: Convert to fraction form
   2,421.78/3,343.32 = 1,636.89/x
3. Step 3: Cross multiply
   2,421.78x = 3,343.32 × 1,636.89
4. Step 4: Simplify right side
   2,421.78x = 5,472,647.07
5. Step 5: Solve for x
   x = 5,472,647.07/2,421.78
6. Step 6: Final answer
   x = 2,259.76