Finding the Fourth Proportional to 83,171.80, 124,563.30 and 81,501.40

Step by Step Solution

1. Step 1: Write the proportion equation
   83,171.80 : 124,563.30 = 81,501.40 : x
2. Step 2: Convert to fraction form
   83,171.80/124,563.30 = 81,501.40/x
3. Step 3: Cross multiply
   83,171.80x = 124,563.30 × 81,501.40
4. Step 4: Simplify right side
   83,171.80x = 10,152,083,338.62
5. Step 5: Solve for x
   x = 10,152,083,338.62/83,171.80
6. Step 6: Final answer
   x = 122,061.60