Finding the Fourth Proportional to 105,518.71, 158,140.77 and 80,466.63

Step by Step Solution

1. Step 1: Write the proportion equation
   105,518.71 : 158,140.77 = 80,466.63 : x
2. Step 2: Convert to fraction form
   105,518.71/158,140.77 = 80,466.63/x
3. Step 3: Cross multiply
   105,518.71x = 158,140.77 × 80,466.63
4. Step 4: Simplify right side
   105,518.71x = 12,725,054,827.51
5. Step 5: Solve for x
   x = 12,725,054,827.51/105,518.71
6. Step 6: Final answer
   x = 120,595.25