Finding the Fourth Proportional to 39,111.07, 53,973.41 and 21,206.10

Step by Step Solution

1. Step 1: Write the proportion equation
   39,111.07 : 53,973.41 = 21,206.10 : x
2. Step 2: Convert to fraction form
   39,111.07/53,973.41 = 21,206.10/x
3. Step 3: Cross multiply
   39,111.07x = 53,973.41 × 21,206.10
4. Step 4: Simplify right side
   39,111.07x = 1,144,565,529.80
5. Step 5: Solve for x
   x = 1,144,565,529.80/39,111.07
6. Step 6: Final answer
   x = 29,264.49