Finding the Fourth Proportional to 42,789.14, 64,183.89 and 28,091.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.14 : 64,183.89 = 28,091.06 : x
2. Step 2: Convert to fraction form
   42,789.14/64,183.89 = 28,091.06/x
3. Step 3: Cross multiply
   42,789.14x = 64,183.89 × 28,091.06
4. Step 4: Simplify right side
   42,789.14x = 1,802,993,505.02
5. Step 5: Solve for x
   x = 1,802,993,505.02/42,789.14
6. Step 6: Final answer
   x = 42,136.71