Finding the Fourth Proportional to 124,311, 171,504.20 and 81,315

Step by Step Solution

1. Step 1: Write the proportion equation
   124,311 : 171,504.20 = 81,315 : x
2. Step 2: Convert to fraction form
   124,311/171,504.20 = 81,315/x
3. Step 3: Cross multiply
   124,311x = 171,504.20 × 81,315
4. Step 4: Simplify right side
   124,311x = 13,945,863,616.43
5. Step 5: Solve for x
   x = 13,945,863,616.43/124,311
6. Step 6: Final answer
   x = 112,185.27