Finding the Fourth Proportional to 2,636.72, 3,638.64 and 1,457.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.72 : 3,638.64 = 1,457.78 : x
2. Step 2: Convert to fraction form
   2,636.72/3,638.64 = 1,457.78/x
3. Step 3: Cross multiply
   2,636.72x = 3,638.64 × 1,457.78
4. Step 4: Simplify right side
   2,636.72x = 5,304,336.62
5. Step 5: Solve for x
   x = 5,304,336.62/2,636.72
6. Step 6: Final answer
   x = 2,011.72