Finding the Fourth Proportional to 2,672.76, 4,009.72 and 1,287.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,672.76 : 4,009.72 = 1,287.64 : x
2. Step 2: Convert to fraction form
   2,672.76/4,009.72 = 1,287.64/x
3. Step 3: Cross multiply
   2,672.76x = 4,009.72 × 1,287.64
4. Step 4: Simplify right side
   2,672.76x = 5,163,075.86
5. Step 5: Solve for x
   x = 5,163,075.86/2,672.76
6. Step 6: Final answer
   x = 1,931.74