Finding the Fourth Proportional to 2,662.31, 3,991.78 and 1,274.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.31 : 3,991.78 = 1,274.92 : x
2. Step 2: Convert to fraction form
   2,662.31/3,991.78 = 1,274.92/x
3. Step 3: Cross multiply
   2,662.31x = 3,991.78 × 1,274.92
4. Step 4: Simplify right side
   2,662.31x = 5,089,200.16
5. Step 5: Solve for x
   x = 5,089,200.16/2,662.31
6. Step 6: Final answer
   x = 1,911.57