Finding the Fourth Proportional to 28,318.50, 42,482.61 and 8,599.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,318.50 : 42,482.61 = 8,599.05 : x
2. Step 2: Convert to fraction form
   28,318.50/42,482.61 = 8,599.05/x
3. Step 3: Cross multiply
   28,318.50x = 42,482.61 × 8,599.05
4. Step 4: Simplify right side
   28,318.50x = 365,310,087.52
5. Step 5: Solve for x
   x = 365,310,087.52/28,318.50
6. Step 6: Final answer
   x = 12,900.05