Finding the Fourth Proportional to 65,786.88, 90,788.16 and 35,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   65,786.88 : 90,788.16 = 35,978.88 : x
2. Step 2: Convert to fraction form
   65,786.88/90,788.16 = 35,978.88/x
3. Step 3: Cross multiply
   65,786.88x = 90,788.16 × 35,978.88
4. Step 4: Simplify right side
   65,786.88x = 3,266,456,314.06
5. Step 5: Solve for x
   x = 3,266,456,314.06/65,786.88
6. Step 6: Final answer
   x = 49,652.09