Finding the Fourth Proportional to 39,111.59, 53,973.14 and 21,206.14

Step by Step Solution

1. Step 1: Write the proportion equation
   39,111.59 : 53,973.14 = 21,206.14 : x
2. Step 2: Convert to fraction form
   39,111.59/53,973.14 = 21,206.14/x
3. Step 3: Cross multiply
   39,111.59x = 53,973.14 × 21,206.14
4. Step 4: Simplify right side
   39,111.59x = 1,144,561,722.12
5. Step 5: Solve for x
   x = 1,144,561,722.12/39,111.59
6. Step 6: Final answer
   x = 29,264.00