Finding the Fourth Proportional to 51,949.31, 71,680.92 and 30,720.83

Step by Step Solution

1. Step 1: Write the proportion equation
   51,949.31 : 71,680.92 = 30,720.83 : x
2. Step 2: Convert to fraction form
   51,949.31/71,680.92 = 30,720.83/x
3. Step 3: Cross multiply
   51,949.31x = 71,680.92 × 30,720.83
4. Step 4: Simplify right side
   51,949.31x = 2,202,096,999.16
5. Step 5: Solve for x
   x = 2,202,096,999.16/51,949.31
6. Step 6: Final answer
   x = 42,389.34