Finding the Fourth Proportional to 39,892.50, 55,051.41 and 21,743.20

Step by Step Solution

1. Step 1: Write the proportion equation
   39,892.50 : 55,051.41 = 21,743.20 : x
2. Step 2: Convert to fraction form
   39,892.50/55,051.41 = 21,743.20/x
3. Step 3: Cross multiply
   39,892.50x = 55,051.41 × 21,743.20
4. Step 4: Simplify right side
   39,892.50x = 1,196,993,968.26
5. Step 5: Solve for x
   x = 1,196,993,968.26/39,892.50
6. Step 6: Final answer
   x = 30,005.49