Finding the Fourth Proportional to 28,158.12, 42,224.72 and 8,433

Step by Step Solution

1. Step 1: Write the proportion equation
   28,158.12 : 42,224.72 = 8,433 : x
2. Step 2: Convert to fraction form
   28,158.12/42,224.72 = 8,433/x
3. Step 3: Cross multiply
   28,158.12x = 42,224.72 × 8,433
4. Step 4: Simplify right side
   28,158.12x = 356,081,021.60
5. Step 5: Solve for x
   x = 356,081,021.60/28,158.12
6. Step 6: Final answer
   x = 12,645.77