Finding the Fourth Proportional to 39,016.29, 53,842.47 and 21,111.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,016.29 : 53,842.47 = 21,111.31 : x
2. Step 2: Convert to fraction form
   39,016.29/53,842.47 = 21,111.31/x
3. Step 3: Cross multiply
   39,016.29x = 53,842.47 × 21,111.31
4. Step 4: Simplify right side
   39,016.29x = 1,136,684,806.12
5. Step 5: Solve for x
   x = 1,136,684,806.12/39,016.29
6. Step 6: Final answer
   x = 29,133.60