Finding the Fourth Proportional to 39,105.09, 53,965.30 and 21,200.38

Step by Step Solution

1. Step 1: Write the proportion equation
   39,105.09 : 53,965.30 = 21,200.38 : x
2. Step 2: Convert to fraction form
   39,105.09/53,965.30 = 21,200.38/x
3. Step 3: Cross multiply
   39,105.09x = 53,965.30 × 21,200.38
4. Step 4: Simplify right side
   39,105.09x = 1,144,084,866.81
5. Step 5: Solve for x
   x = 1,144,084,866.81/39,105.09
6. Step 6: Final answer
   x = 29,256.67