Finding the Fourth Proportional to 2,655, 3,978.72 and 1,267.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655 : 3,978.72 = 1,267.20 : x
2. Step 2: Convert to fraction form
   2,655/3,978.72 = 1,267.20/x
3. Step 3: Cross multiply
   2,655x = 3,978.72 × 1,267.20
4. Step 4: Simplify right side
   2,655x = 5,041,833.98
5. Step 5: Solve for x
   x = 5,041,833.98/2,655
6. Step 6: Final answer
   x = 1,899.00