Finding the Fourth Proportional to 64,979.72, 89,672.28 and 35,171.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,979.72 : 89,672.28 = 35,171.72 : x
2. Step 2: Convert to fraction form
   64,979.72/89,672.28 = 35,171.72/x
3. Step 3: Cross multiply
   64,979.72x = 89,672.28 × 35,171.72
4. Step 4: Simplify right side
   64,979.72x = 3,153,928,323.92
5. Step 5: Solve for x
   x = 3,153,928,323.92/64,979.72
6. Step 6: Final answer
   x = 48,537.12