Finding the Fourth Proportional to 38,982.72, 53,796.56 and 21,078.08

Step by Step Solution

1. Step 1: Write the proportion equation
   38,982.72 : 53,796.56 = 21,078.08 : x
2. Step 2: Convert to fraction form
   38,982.72/53,796.56 = 21,078.08/x
3. Step 3: Cross multiply
   38,982.72x = 53,796.56 × 21,078.08
4. Step 4: Simplify right side
   38,982.72x = 1,133,927,821.03
5. Step 5: Solve for x
   x = 1,133,927,821.03/38,982.72
6. Step 6: Final answer
   x = 29,087.96