Finding the Fourth Proportional to 72,939.31, 109,420.64 and 30,819.80

Step by Step Solution

1. Step 1: Write the proportion equation
   72,939.31 : 109,420.64 = 30,819.80 : x
2. Step 2: Convert to fraction form
   72,939.31/109,420.64 = 30,819.80/x
3. Step 3: Cross multiply
   72,939.31x = 109,420.64 × 30,819.80
4. Step 4: Simplify right side
   72,939.31x = 3,372,322,240.67
5. Step 5: Solve for x
   x = 3,372,322,240.67/72,939.31
6. Step 6: Final answer
   x = 46,234.63