Finding the Fourth Proportional to 28,099.05, 42,143.91 and 8,372.99

Step by Step Solution

1. Step 1: Write the proportion equation
   28,099.05 : 42,143.91 = 8,372.99 : x
2. Step 2: Convert to fraction form
   28,099.05/42,143.91 = 8,372.99/x
3. Step 3: Cross multiply
   28,099.05x = 42,143.91 × 8,372.99
4. Step 4: Simplify right side
   28,099.05x = 352,870,326.27
5. Step 5: Solve for x
   x = 352,870,326.27/28,099.05
6. Step 6: Final answer
   x = 12,558.09