Finding the Fourth Proportional to 65,145.92, 89,915.81 and 39,646.94

Step by Step Solution

1. Step 1: Write the proportion equation
   65,145.92 : 89,915.81 = 39,646.94 : x
2. Step 2: Convert to fraction form
   65,145.92/89,915.81 = 39,646.94/x
3. Step 3: Cross multiply
   65,145.92x = 89,915.81 × 39,646.94
4. Step 4: Simplify right side
   65,145.92x = 3,564,886,076.31
5. Step 5: Solve for x
   x = 3,564,886,076.31/65,145.92
6. Step 6: Final answer
   x = 54,721.56