Finding the Fourth Proportional to 39,411.54, 54,387.54 and 21,506.67

Step by Step Solution

1. Step 1: Write the proportion equation
   39,411.54 : 54,387.54 = 21,506.67 : x
2. Step 2: Convert to fraction form
   39,411.54/54,387.54 = 21,506.67/x
3. Step 3: Cross multiply
   39,411.54x = 54,387.54 × 21,506.67
4. Step 4: Simplify right side
   39,411.54x = 1,169,694,874.89
5. Step 5: Solve for x
   x = 1,169,694,874.89/39,411.54
6. Step 6: Final answer
   x = 29,678.99