Finding the Fourth Proportional to 491,131.84, 677,858.72 and 319,262.72

Step by Step Solution

1. Step 1: Write the proportion equation
   491,131.84 : 677,858.72 = 319,262.72 : x
2. Step 2: Convert to fraction form
   491,131.84/677,858.72 = 319,262.72/x
3. Step 3: Cross multiply
   491,131.84x = 677,858.72 × 319,262.72
4. Step 4: Simplify right side
   491,131.84x = 216,415,018,722.92
5. Step 5: Solve for x
   x = 216,415,018,722.92/491,131.84
6. Step 6: Final answer
   x = 440,645.47