Finding the Fourth Proportional to 71,142.91, 106,757.06 and 28,440.69

Step by Step Solution

1. Step 1: Write the proportion equation
   71,142.91 : 106,757.06 = 28,440.69 : x
2. Step 2: Convert to fraction form
   71,142.91/106,757.06 = 28,440.69/x
3. Step 3: Cross multiply
   71,142.91x = 106,757.06 × 28,440.69
4. Step 4: Simplify right side
   71,142.91x = 3,036,243,906.23
5. Step 5: Solve for x
   x = 3,036,243,906.23/71,142.91
6. Step 6: Final answer
   x = 42,678.10