Finding the Fourth Proportional to 1,899.30, 2,831.34 and 1,869.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.30 : 2,831.34 = 1,869.31 : x
2. Step 2: Convert to fraction form
   1,899.30/2,831.34 = 1,869.31/x
3. Step 3: Cross multiply
   1,899.30x = 2,831.34 × 1,869.31
4. Step 4: Simplify right side
   1,899.30x = 5,292,642.83
5. Step 5: Solve for x
   x = 5,292,642.83/1,899.30
6. Step 6: Final answer
   x = 2,786.64