Finding the Fourth Proportional to 45,728.82, 68,935.98 and 42,680.69

Step by Step Solution

1. Step 1: Write the proportion equation
   45,728.82 : 68,935.98 = 42,680.69 : x
2. Step 2: Convert to fraction form
   45,728.82/68,935.98 = 42,680.69/x
3. Step 3: Cross multiply
   45,728.82x = 68,935.98 × 42,680.69
4. Step 4: Simplify right side
   45,728.82x = 2,942,235,364.57
5. Step 5: Solve for x
   x = 2,942,235,364.57/45,728.82
6. Step 6: Final answer
   x = 64,340.94