Finding the Fourth Proportional to 65,505.73, 90,306.37 and 55,393.60

Step by Step Solution

1. Step 1: Write the proportion equation
   65,505.73 : 90,306.37 = 55,393.60 : x
2. Step 2: Convert to fraction form
   65,505.73/90,306.37 = 55,393.60/x
3. Step 3: Cross multiply
   65,505.73x = 90,306.37 × 55,393.60
4. Step 4: Simplify right side
   65,505.73x = 5,002,394,208.73
5. Step 5: Solve for x
   x = 5,002,394,208.73/65,505.73
6. Step 6: Final answer
   x = 76,365.76