Finding the Fourth Proportional to 28,157.76, 42,235.02 and 8,436.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,157.76 : 42,235.02 = 8,436.69 : x
2. Step 2: Convert to fraction form
   28,157.76/42,235.02 = 8,436.69/x
3. Step 3: Cross multiply
   28,157.76x = 42,235.02 × 8,436.69
4. Step 4: Simplify right side
   28,157.76x = 356,323,770.88
5. Step 5: Solve for x
   x = 356,323,770.88/28,157.76
6. Step 6: Final answer
   x = 12,654.55