Finding the Fourth Proportional to 65,938.09, 90,978.81 and 39,075.97

Step by Step Solution

1. Step 1: Write the proportion equation
   65,938.09 : 90,978.81 = 39,075.97 : x
2. Step 2: Convert to fraction form
   65,938.09/90,978.81 = 39,075.97/x
3. Step 3: Cross multiply
   65,938.09x = 90,978.81 × 39,075.97
4. Step 4: Simplify right side
   65,938.09x = 3,555,085,250.20
5. Step 5: Solve for x
   x = 3,555,085,250.20/65,938.09
6. Step 6: Final answer
   x = 53,915.50