Finding the Fourth Proportional to 687,647,019.54, 1,031,470,848.72 and 221,308,377.96

Step by Step Solution

1. Step 1: Write the proportion equation
   687,647,019.54 : 1,031,470,848.72 = 221,308,377.96 : x
2. Step 2: Convert to fraction form
   687,647,019.54/1,031,470,848.72 = 221,308,377.96/x
3. Step 3: Cross multiply
   687,647,019.54x = 1,031,470,848.72 × 221,308,377.96
4. Step 4: Simplify right side
   687,647,019.54x = 228,273,140,443,247,744
5. Step 5: Solve for x
   x = 228,273,140,443,247,744/687,647,019.54
6. Step 6: Final answer
   x = 331,962,669.74