Finding the Fourth Proportional to 39,556.24, 54,585.50 and 21,647.78

Step by Step Solution

1. Step 1: Write the proportion equation
   39,556.24 : 54,585.50 = 21,647.78 : x
2. Step 2: Convert to fraction form
   39,556.24/54,585.50 = 21,647.78/x
3. Step 3: Cross multiply
   39,556.24x = 54,585.50 × 21,647.78
4. Step 4: Simplify right side
   39,556.24x = 1,181,654,718.72
5. Step 5: Solve for x
   x = 1,181,654,718.72/39,556.24
6. Step 6: Final answer
   x = 29,872.78