Finding the Fourth Proportional to 51,287.48, 76,939.31 and 21,705.47

Step by Step Solution

1. Step 1: Write the proportion equation
   51,287.48 : 76,939.31 = 21,705.47 : x
2. Step 2: Convert to fraction form
   51,287.48/76,939.31 = 21,705.47/x
3. Step 3: Cross multiply
   51,287.48x = 76,939.31 × 21,705.47
4. Step 4: Simplify right side
   51,287.48x = 1,670,003,554.59
5. Step 5: Solve for x
   x = 1,670,003,554.59/51,287.48
6. Step 6: Final answer
   x = 32,561.63