Finding the Fourth Proportional to 81,792.42, 122,688.42 and 25,636.80

Step by Step Solution

1. Step 1: Write the proportion equation
   81,792.42 : 122,688.42 = 25,636.80 : x
2. Step 2: Convert to fraction form
   81,792.42/122,688.42 = 25,636.80/x
3. Step 3: Cross multiply
   81,792.42x = 122,688.42 × 25,636.80
4. Step 4: Simplify right side
   81,792.42x = 3,145,338,485.86
5. Step 5: Solve for x
   x = 3,145,338,485.86/81,792.42
6. Step 6: Final answer
   x = 38,455.13