Finding the Fourth Proportional to 2,570.88, 3,856.50 and 1,272

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.88 : 3,856.50 = 1,272 : x
2. Step 2: Convert to fraction form
   2,570.88/3,856.50 = 1,272/x
3. Step 3: Cross multiply
   2,570.88x = 3,856.50 × 1,272
4. Step 4: Simplify right side
   2,570.88x = 4,905,468
5. Step 5: Solve for x
   x = 4,905,468/2,570.88
6. Step 6: Final answer
   x = 1,908.09