Finding the Fourth Proportional to 51,287.31, 76,939.25 and 21,705.48

Step by Step Solution

1. Step 1: Write the proportion equation
   51,287.31 : 76,939.25 = 21,705.48 : x
2. Step 2: Convert to fraction form
   51,287.31/76,939.25 = 21,705.48/x
3. Step 3: Cross multiply
   51,287.31x = 76,939.25 × 21,705.48
4. Step 4: Simplify right side
   51,287.31x = 1,670,003,243.56
5. Step 5: Solve for x
   x = 1,670,003,243.56/51,287.31
6. Step 6: Final answer
   x = 32,561.72