Finding the Fourth Proportional to 2,748.24, 4,122.72 and 1,287.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,748.24 : 4,122.72 = 1,287.72 : x
2. Step 2: Convert to fraction form
   2,748.24/4,122.72 = 1,287.72/x
3. Step 3: Cross multiply
   2,748.24x = 4,122.72 × 1,287.72
4. Step 4: Simplify right side
   2,748.24x = 5,308,909.00
5. Step 5: Solve for x
   x = 5,308,909.00/2,748.24
6. Step 6: Final answer
   x = 1,931.75