Finding the Fourth Proportional to 711,978.18, 1,067,831.16 and 213,342.18

Step by Step Solution

1. Step 1: Write the proportion equation
   711,978.18 : 1,067,831.16 = 213,342.18 : x
2. Step 2: Convert to fraction form
   711,978.18/1,067,831.16 = 213,342.18/x
3. Step 3: Cross multiply
   711,978.18x = 1,067,831.16 × 213,342.18
4. Step 4: Simplify right side
   711,978.18x = 227,813,427,546.33
5. Step 5: Solve for x
   x = 227,813,427,546.33/711,978.18
6. Step 6: Final answer
   x = 319,972.49