Finding the Fourth Proportional to 65,797.72, 90,807.89 and 40,320.99

Step by Step Solution

1. Step 1: Write the proportion equation
   65,797.72 : 90,807.89 = 40,320.99 : x
2. Step 2: Convert to fraction form
   65,797.72/90,807.89 = 40,320.99/x
3. Step 3: Cross multiply
   65,797.72x = 90,807.89 × 40,320.99
4. Step 4: Simplify right side
   65,797.72x = 3,661,463,823.01
5. Step 5: Solve for x
   x = 3,661,463,823.01/65,797.72
6. Step 6: Final answer
   x = 55,647.28