Finding the Fourth Proportional to 105,169.30, 145,116.50 and 62,142.80

Step by Step Solution

1. Step 1: Write the proportion equation
   105,169.30 : 145,116.50 = 62,142.80 : x
2. Step 2: Convert to fraction form
   105,169.30/145,116.50 = 62,142.80/x
3. Step 3: Cross multiply
   105,169.30x = 145,116.50 × 62,142.80
4. Step 4: Simplify right side
   105,169.30x = 9,017,945,636.20
5. Step 5: Solve for x
   x = 9,017,945,636.20/105,169.30
6. Step 6: Final answer
   x = 85,746.94