Finding the Fourth Proportional to 2,086.71, 3,128.67 and 1,251.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.71 : 3,128.67 = 1,251.89 : x
2. Step 2: Convert to fraction form
   2,086.71/3,128.67 = 1,251.89/x
3. Step 3: Cross multiply
   2,086.71x = 3,128.67 × 1,251.89
4. Step 4: Simplify right side
   2,086.71x = 3,916,746.78
5. Step 5: Solve for x
   x = 3,916,746.78/2,086.71
6. Step 6: Final answer
   x = 1,877.00