Finding the Fourth Proportional to 39,055.43, 53,896.42 and 21,150.38

Step by Step Solution

1. Step 1: Write the proportion equation
   39,055.43 : 53,896.42 = 21,150.38 : x
2. Step 2: Convert to fraction form
   39,055.43/53,896.42 = 21,150.38/x
3. Step 3: Cross multiply
   39,055.43x = 53,896.42 × 21,150.38
4. Step 4: Simplify right side
   39,055.43x = 1,139,929,657.89
5. Step 5: Solve for x
   x = 1,139,929,657.89/39,055.43
6. Step 6: Final answer
   x = 29,187.48