Finding the Fourth Proportional to 687,419.34, 1,031,243.22 and 288,090.15

Step by Step Solution

1. Step 1: Write the proportion equation
   687,419.34 : 1,031,243.22 = 288,090.15 : x
2. Step 2: Convert to fraction form
   687,419.34/1,031,243.22 = 288,090.15/x
3. Step 3: Cross multiply
   687,419.34x = 1,031,243.22 × 288,090.15
4. Step 4: Simplify right side
   687,419.34x = 297,091,013,936.28
5. Step 5: Solve for x
   x = 297,091,013,936.28/687,419.34
6. Step 6: Final answer
   x = 432,183.09