Finding the Fourth Proportional to 121,131.78, 167,018.81 and 82,909.78

Step by Step Solution

1. Step 1: Write the proportion equation
   121,131.78 : 167,018.81 = 82,909.78 : x
2. Step 2: Convert to fraction form
   121,131.78/167,018.81 = 82,909.78/x
3. Step 3: Cross multiply
   121,131.78x = 167,018.81 × 82,909.78
4. Step 4: Simplify right side
   121,131.78x = 13,847,492,792.96
5. Step 5: Solve for x
   x = 13,847,492,792.96/121,131.78
6. Step 6: Final answer
   x = 114,317.59