Finding the Fourth Proportional to 65,958.10, 98,936.10 and 20,978.81

Step by Step Solution

1. Step 1: Write the proportion equation
   65,958.10 : 98,936.10 = 20,978.81 : x
2. Step 2: Convert to fraction form
   65,958.10/98,936.10 = 20,978.81/x
3. Step 3: Cross multiply
   65,958.10x = 98,936.10 × 20,978.81
4. Step 4: Simplify right side
   65,958.10x = 2,075,561,520.37
5. Step 5: Solve for x
   x = 2,075,561,520.37/65,958.10
6. Step 6: Final answer
   x = 31,467.88