Finding the Fourth Proportional to 65,064.48, 89,795.28 and 39,930.40

Step by Step Solution

1. Step 1: Write the proportion equation
   65,064.48 : 89,795.28 = 39,930.40 : x
2. Step 2: Convert to fraction form
   65,064.48/89,795.28 = 39,930.40/x
3. Step 3: Cross multiply
   65,064.48x = 89,795.28 × 39,930.40
4. Step 4: Simplify right side
   65,064.48x = 3,585,561,448.51
5. Step 5: Solve for x
   x = 3,585,561,448.51/65,064.48
6. Step 6: Final answer
   x = 55,107.82