Finding the Fourth Proportional to 39,678.17, 54,755.72 and 21,773.48

Step by Step Solution

1. Step 1: Write the proportion equation
   39,678.17 : 54,755.72 = 21,773.48 : x
2. Step 2: Convert to fraction form
   39,678.17/54,755.72 = 21,773.48/x
3. Step 3: Cross multiply
   39,678.17x = 54,755.72 × 21,773.48
4. Step 4: Simplify right side
   39,678.17x = 1,192,222,273.31
5. Step 5: Solve for x
   x = 1,192,222,273.31/39,678.17
6. Step 6: Final answer
   x = 30,047.31