Finding the Fourth Proportional to 693,480.58, 1,040,334.72 and 213,708.47

Step by Step Solution

1. Step 1: Write the proportion equation
   693,480.58 : 1,040,334.72 = 213,708.47 : x
2. Step 2: Convert to fraction form
   693,480.58/1,040,334.72 = 213,708.47/x
3. Step 3: Cross multiply
   693,480.58x = 1,040,334.72 × 213,708.47
4. Step 4: Simplify right side
   693,480.58x = 222,328,335,028.86
5. Step 5: Solve for x
   x = 222,328,335,028.86/693,480.58
6. Step 6: Final answer
   x = 320,597.78