Finding the Fourth Proportional to 105,521.48, 158,223.90 and 80,230.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,521.48 : 158,223.90 = 80,230.12 : x
2. Step 2: Convert to fraction form
   105,521.48/158,223.90 = 80,230.12/x
3. Step 3: Cross multiply
   105,521.48x = 158,223.90 × 80,230.12
4. Step 4: Simplify right side
   105,521.48x = 12,694,322,483.87
5. Step 5: Solve for x
   x = 12,694,322,483.87/105,521.48
6. Step 6: Final answer
   x = 120,300.84