Finding the Fourth Proportional to 28,086.72, 42,135.72 and 11,446.56

Step by Step Solution

1. Step 1: Write the proportion equation
   28,086.72 : 42,135.72 = 11,446.56 : x
2. Step 2: Convert to fraction form
   28,086.72/42,135.72 = 11,446.56/x
3. Step 3: Cross multiply
   28,086.72x = 42,135.72 × 11,446.56
4. Step 4: Simplify right side
   28,086.72x = 482,309,047.12
5. Step 5: Solve for x
   x = 482,309,047.12/28,086.72
6. Step 6: Final answer
   x = 17,172.14