Finding the Fourth Proportional to 20,429.50, 28,173.99 and 13,251.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,429.50 : 28,173.99 = 13,251.94 : x
2. Step 2: Convert to fraction form
   20,429.50/28,173.99 = 13,251.94/x
3. Step 3: Cross multiply
   20,429.50x = 28,173.99 × 13,251.94
4. Step 4: Simplify right side
   20,429.50x = 373,360,025.04
5. Step 5: Solve for x
   x = 373,360,025.04/20,429.50
6. Step 6: Final answer
   x = 18,275.53