Finding the Fourth Proportional to 3,145.31, 4,340.61 and 1,886.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,145.31 : 4,340.61 = 1,886.57 : x
2. Step 2: Convert to fraction form
   3,145.31/4,340.61 = 1,886.57/x
3. Step 3: Cross multiply
   3,145.31x = 4,340.61 × 1,886.57
4. Step 4: Simplify right side
   3,145.31x = 8,188,864.61
5. Step 5: Solve for x
   x = 8,188,864.61/3,145.31
6. Step 6: Final answer
   x = 2,603.52