Finding the Fourth Proportional to 39,859.31, 55,004.72 and 21,709.63

Step by Step Solution

1. Step 1: Write the proportion equation
   39,859.31 : 55,004.72 = 21,709.63 : x
2. Step 2: Convert to fraction form
   39,859.31/55,004.72 = 21,709.63/x
3. Step 3: Cross multiply
   39,859.31x = 55,004.72 × 21,709.63
4. Step 4: Simplify right side
   39,859.31x = 1,194,131,735.88
5. Step 5: Solve for x
   x = 1,194,131,735.88/39,859.31
6. Step 6: Final answer
   x = 29,958.67