Finding the Fourth Proportional to 64,485.69, 89,033.61 and 49,351.31

Step by Step Solution

1. Step 1: Write the proportion equation
   64,485.69 : 89,033.61 = 49,351.31 : x
2. Step 2: Convert to fraction form
   64,485.69/89,033.61 = 49,351.31/x
3. Step 3: Cross multiply
   64,485.69x = 89,033.61 × 49,351.31
4. Step 4: Simplify right side
   64,485.69x = 4,393,925,361.30
5. Step 5: Solve for x
   x = 4,393,925,361.30/64,485.69
6. Step 6: Final answer
   x = 68,137.99