Finding the Fourth Proportional to 28,259.94, 42,328.41 and 13,423.89

Step by Step Solution

1. Step 1: Write the proportion equation
   28,259.94 : 42,328.41 = 13,423.89 : x
2. Step 2: Convert to fraction form
   28,259.94/42,328.41 = 13,423.89/x
3. Step 3: Cross multiply
   28,259.94x = 42,328.41 × 13,423.89
4. Step 4: Simplify right side
   28,259.94x = 568,211,919.71
5. Step 5: Solve for x
   x = 568,211,919.71/28,259.94
6. Step 6: Final answer
   x = 20,106.62