Finding the Fourth Proportional to 39,111.22, 53,973.23 and 21,206.17

Step by Step Solution

1. Step 1: Write the proportion equation
   39,111.22 : 53,973.23 = 21,206.17 : x
2. Step 2: Convert to fraction form
   39,111.22/53,973.23 = 21,206.17/x
3. Step 3: Cross multiply
   39,111.22x = 53,973.23 × 21,206.17
4. Step 4: Simplify right side
   39,111.22x = 1,144,565,490.83
5. Step 5: Solve for x
   x = 1,144,565,490.83/39,111.22
6. Step 6: Final answer
   x = 29,264.38