Finding the Fourth Proportional to 65,786.72, 90,784.32 and 35,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,786.72 : 90,784.32 = 35,978.72 : x
2. Step 2: Convert to fraction form
   65,786.72/90,784.32 = 35,978.72/x
3. Step 3: Cross multiply
   65,786.72x = 90,784.32 × 35,978.72
4. Step 4: Simplify right side
   65,786.72x = 3,266,303,629.67
5. Step 5: Solve for x
   x = 3,266,303,629.67/65,786.72
6. Step 6: Final answer
   x = 49,649.89