Finding the Fourth Proportional to 65,960.79, 91,046.57 and 42,087.42

Step by Step Solution

1. Step 1: Write the proportion equation
   65,960.79 : 91,046.57 = 42,087.42 : x
2. Step 2: Convert to fraction form
   65,960.79/91,046.57 = 42,087.42/x
3. Step 3: Cross multiply
   65,960.79x = 91,046.57 × 42,087.42
4. Step 4: Simplify right side
   65,960.79x = 3,831,915,020.71
5. Step 5: Solve for x
   x = 3,831,915,020.71/65,960.79
6. Step 6: Final answer
   x = 58,093.83