Finding the Fourth Proportional to 28,139.35, 42,214.98 and 10,609.33

Step by Step Solution

1. Step 1: Write the proportion equation
   28,139.35 : 42,214.98 = 10,609.33 : x
2. Step 2: Convert to fraction form
   28,139.35/42,214.98 = 10,609.33/x
3. Step 3: Cross multiply
   28,139.35x = 42,214.98 × 10,609.33
4. Step 4: Simplify right side
   28,139.35x = 447,872,653.76
5. Step 5: Solve for x
   x = 447,872,653.76/28,139.35
6. Step 6: Final answer
   x = 15,916.24