Finding the Fourth Proportional to 42,979.73, 64,469.28 and 30,277.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,979.73 : 64,469.28 = 30,277.20 : x
2. Step 2: Convert to fraction form
   42,979.73/64,469.28 = 30,277.20/x
3. Step 3: Cross multiply
   42,979.73x = 64,469.28 × 30,277.20
4. Step 4: Simplify right side
   42,979.73x = 1,951,949,639.72
5. Step 5: Solve for x
   x = 1,951,949,639.72/42,979.73
6. Step 6: Final answer
   x = 45,415.59