Finding the Fourth Proportional to 28,328.74, 42,454.81 and 10,789

Step by Step Solution

1. Step 1: Write the proportion equation
   28,328.74 : 42,454.81 = 10,789 : x
2. Step 2: Convert to fraction form
   28,328.74/42,454.81 = 10,789/x
3. Step 3: Cross multiply
   28,328.74x = 42,454.81 × 10,789
4. Step 4: Simplify right side
   28,328.74x = 458,044,945.09
5. Step 5: Solve for x
   x = 458,044,945.09/28,328.74
6. Step 6: Final answer
   x = 16,168.91