Finding the Fourth Proportional to 2,790, 4,185.72 and 1,251

Step by Step Solution

1. Step 1: Write the proportion equation
   2,790 : 4,185.72 = 1,251 : x
2. Step 2: Convert to fraction form
   2,790/4,185.72 = 1,251/x
3. Step 3: Cross multiply
   2,790x = 4,185.72 × 1,251
4. Step 4: Simplify right side
   2,790x = 5,236,335.72
5. Step 5: Solve for x
   x = 5,236,335.72/2,790
6. Step 6: Final answer
   x = 1,876.82