Finding the Fourth Proportional to 1,612.31, 2,417.25 and 831.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,612.31 : 2,417.25 = 831.47 : x
2. Step 2: Convert to fraction form
   1,612.31/2,417.25 = 831.47/x
3. Step 3: Cross multiply
   1,612.31x = 2,417.25 × 831.47
4. Step 4: Simplify right side
   1,612.31x = 2,009,870.86
5. Step 5: Solve for x
   x = 2,009,870.86/1,612.31
6. Step 6: Final answer
   x = 1,246.58