Finding the Fourth Proportional to 587,196.56, 810,335.40 and 318,924.56

Step by Step Solution

1. Step 1: Write the proportion equation
   587,196.56 : 810,335.40 = 318,924.56 : x
2. Step 2: Convert to fraction form
   587,196.56/810,335.40 = 318,924.56/x
3. Step 3: Cross multiply
   587,196.56x = 810,335.40 × 318,924.56
4. Step 4: Simplify right side
   587,196.56x = 258,435,860,897.42
5. Step 5: Solve for x
   x = 258,435,860,897.42/587,196.56
6. Step 6: Final answer
   x = 440,118.15