Finding the Fourth Proportional to 39,111.47, 53,973.57 and 21,206.42

Step by Step Solution

1. Step 1: Write the proportion equation
   39,111.47 : 53,973.57 = 21,206.42 : x
2. Step 2: Convert to fraction form
   39,111.47/53,973.57 = 21,206.42/x
3. Step 3: Cross multiply
   39,111.47x = 53,973.57 × 21,206.42
4. Step 4: Simplify right side
   39,111.47x = 1,144,586,194.32
5. Step 5: Solve for x
   x = 1,144,586,194.32/39,111.47
6. Step 6: Final answer
   x = 29,264.72