Finding the Fourth Proportional to 2,665.04, 3,991.88 and 1,276.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.04 : 3,991.88 = 1,276.32 : x
2. Step 2: Convert to fraction form
   2,665.04/3,991.88 = 1,276.32/x
3. Step 3: Cross multiply
   2,665.04x = 3,991.88 × 1,276.32
4. Step 4: Simplify right side
   2,665.04x = 5,094,916.28
5. Step 5: Solve for x
   x = 5,094,916.28/2,665.04
6. Step 6: Final answer
   x = 1,911.76