Finding the Fourth Proportional to 39,328.18, 54,272.89 and 21,423.18

Step by Step Solution

1. Step 1: Write the proportion equation
   39,328.18 : 54,272.89 = 21,423.18 : x
2. Step 2: Convert to fraction form
   39,328.18/54,272.89 = 21,423.18/x
3. Step 3: Cross multiply
   39,328.18x = 54,272.89 × 21,423.18
4. Step 4: Simplify right side
   39,328.18x = 1,162,697,891.59
5. Step 5: Solve for x
   x = 1,162,697,891.59/39,328.18
6. Step 6: Final answer
   x = 29,563.99