Finding the Fourth Proportional to 1,886.65, 2,603.39 and 1,047.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.65 : 2,603.39 = 1,047.31 : x
2. Step 2: Convert to fraction form
   1,886.65/2,603.39 = 1,047.31/x
3. Step 3: Cross multiply
   1,886.65x = 2,603.39 × 1,047.31
4. Step 4: Simplify right side
   1,886.65x = 2,726,556.38
5. Step 5: Solve for x
   x = 2,726,556.38/1,886.65
6. Step 6: Final answer
   x = 1,445.18