Finding the Fourth Proportional to 1,858.22, 2,785.89 and 831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.22 : 2,785.89 = 831.50 : x
2. Step 2: Convert to fraction form
   1,858.22/2,785.89 = 831.50/x
3. Step 3: Cross multiply
   1,858.22x = 2,785.89 × 831.50
4. Step 4: Simplify right side
   1,858.22x = 2,316,467.54
5. Step 5: Solve for x
   x = 2,316,467.54/1,858.22
6. Step 6: Final answer
   x = 1,246.61