Finding the Fourth Proportional to 105,572.80, 158,128.80 and 82,014.40

Step by Step Solution

1. Step 1: Write the proportion equation
   105,572.80 : 158,128.80 = 82,014.40 : x
2. Step 2: Convert to fraction form
   105,572.80/158,128.80 = 82,014.40/x
3. Step 3: Cross multiply
   105,572.80x = 158,128.80 × 82,014.40
4. Step 4: Simplify right side
   105,572.80x = 12,968,838,654.72
5. Step 5: Solve for x
   x = 12,968,838,654.72/105,572.80
6. Step 6: Final answer
   x = 122,842.61