Finding the Fourth Proportional to 65,978.57, 91,048.14 and 39,105.11

Step by Step Solution

1. Step 1: Write the proportion equation
   65,978.57 : 91,048.14 = 39,105.11 : x
2. Step 2: Convert to fraction form
   65,978.57/91,048.14 = 39,105.11/x
3. Step 3: Cross multiply
   65,978.57x = 91,048.14 × 39,105.11
4. Step 4: Simplify right side
   65,978.57x = 3,560,447,530.00
5. Step 5: Solve for x
   x = 3,560,447,530.00/65,978.57
6. Step 6: Final answer
   x = 53,963.70