Finding the Fourth Proportional to 2,426.76, 3,643.47 and 1,257.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,426.76 : 3,643.47 = 1,257.72 : x
2. Step 2: Convert to fraction form
   2,426.76/3,643.47 = 1,257.72/x
3. Step 3: Cross multiply
   2,426.76x = 3,643.47 × 1,257.72
4. Step 4: Simplify right side
   2,426.76x = 4,582,465.09
5. Step 5: Solve for x
   x = 4,582,465.09/2,426.76
6. Step 6: Final answer
   x = 1,888.31