Finding the Fourth Proportional to 318,947,105.50, 440,147,302.20 and 172,269,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,947,105.50 : 440,147,302.20 = 172,269,389.50 : x
2. Step 2: Convert to fraction form
   318,947,105.50/440,147,302.20 = 172,269,389.50/x
3. Step 3: Cross multiply
   318,947,105.50x = 440,147,302.20 × 172,269,389.50
4. Step 4: Simplify right side
   318,947,105.50x = 75,823,907,040,066,000
5. Step 5: Solve for x
   x = 75,823,907,040,066,000/318,947,105.50
6. Step 6: Final answer
   x = 237,731,917.71