Finding the Fourth Proportional to 28,231.38, 42,341.00 and 8,505.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,231.38 : 42,341.00 = 8,505.86 : x
2. Step 2: Convert to fraction form
   28,231.38/42,341.00 = 8,505.86/x
3. Step 3: Cross multiply
   28,231.38x = 42,341.00 × 8,505.86
4. Step 4: Simplify right side
   28,231.38x = 360,146,364.03
5. Step 5: Solve for x
   x = 360,146,364.03/28,231.38
6. Step 6: Final answer
   x = 12,756.95