Finding the Fourth Proportional to 809,499,186.72, 1,117,108,640.88 and 438,220,942.56

Step by Step Solution

1. Step 1: Write the proportion equation
   809,499,186.72 : 1,117,108,640.88 = 438,220,942.56 : x
2. Step 2: Convert to fraction form
   809,499,186.72/1,117,108,640.88 = 438,220,942.56/x
3. Step 3: Cross multiply
   809,499,186.72x = 1,117,108,640.88 × 438,220,942.56
4. Step 4: Simplify right side
   809,499,186.72x = 489,540,401,548,354,176
5. Step 5: Solve for x
   x = 489,540,401,548,354,176/809,499,186.72
6. Step 6: Final answer
   x = 604,744,772.55