Finding the Fourth Proportional to 487,022.56, 672,518.72 and 306,048

Step by Step Solution

1. Step 1: Write the proportion equation
   487,022.56 : 672,518.72 = 306,048 : x
2. Step 2: Convert to fraction form
   487,022.56/672,518.72 = 306,048/x
3. Step 3: Cross multiply
   487,022.56x = 672,518.72 × 306,048
4. Step 4: Simplify right side
   487,022.56x = 205,823,009,218.56
5. Step 5: Solve for x
   x = 205,823,009,218.56/487,022.56
6. Step 6: Final answer
   x = 422,614.94