Finding the Fourth Proportional to 8,938.92, 13,401.72 and 5,429.73

Step by Step Solution

1. Step 1: Write the proportion equation
   8,938.92 : 13,401.72 = 5,429.73 : x
2. Step 2: Convert to fraction form
   8,938.92/13,401.72 = 5,429.73/x
3. Step 3: Cross multiply
   8,938.92x = 13,401.72 × 5,429.73
4. Step 4: Simplify right side
   8,938.92x = 72,767,721.14
5. Step 5: Solve for x
   x = 72,767,721.14/8,938.92
6. Step 6: Final answer
   x = 8,140.55