Finding the Fourth Proportional to 2,665.17, 3,996.72 and 1,277.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.17 : 3,996.72 = 1,277.64 : x
2. Step 2: Convert to fraction form
   2,665.17/3,996.72 = 1,277.64/x
3. Step 3: Cross multiply
   2,665.17x = 3,996.72 × 1,277.64
4. Step 4: Simplify right side
   2,665.17x = 5,106,369.34
5. Step 5: Solve for x
   x = 5,106,369.34/2,665.17
6. Step 6: Final answer
   x = 1,915.96