Finding the Fourth Proportional to 39,722.63, 54,817.69 and 21,818.06

Step by Step Solution

1. Step 1: Write the proportion equation
   39,722.63 : 54,817.69 = 21,818.06 : x
2. Step 2: Convert to fraction form
   39,722.63/54,817.69 = 21,818.06/x
3. Step 3: Cross multiply
   39,722.63x = 54,817.69 × 21,818.06
4. Step 4: Simplify right side
   39,722.63x = 1,196,015,320.85
5. Step 5: Solve for x
   x = 1,196,015,320.85/39,722.63
6. Step 6: Final answer
   x = 30,109.17