Finding the Fourth Proportional to 28,129.69, 42,196.16 and 10,599.67

Step by Step Solution

1. Step 1: Write the proportion equation
   28,129.69 : 42,196.16 = 10,599.67 : x
2. Step 2: Convert to fraction form
   28,129.69/42,196.16 = 10,599.67/x
3. Step 3: Cross multiply
   28,129.69x = 42,196.16 × 10,599.67
4. Step 4: Simplify right side
   28,129.69x = 447,265,371.27
5. Step 5: Solve for x
   x = 447,265,371.27/28,129.69
6. Step 6: Final answer
   x = 15,900.12