Finding the Fourth Proportional to 309,488.31, 464,234.22 and 140,890.73

Step by Step Solution

1. Step 1: Write the proportion equation
   309,488.31 : 464,234.22 = 140,890.73 : x
2. Step 2: Convert to fraction form
   309,488.31/464,234.22 = 140,890.73/x
3. Step 3: Cross multiply
   309,488.31x = 464,234.22 × 140,890.73
4. Step 4: Simplify right side
   309,488.31x = 65,406,295,825.61
5. Step 5: Solve for x
   x = 65,406,295,825.61/309,488.31
6. Step 6: Final answer
   x = 211,336.89