Finding the Fourth Proportional to 105,999.30, 146,408.31 and 79,260.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,999.30 : 146,408.31 = 79,260.12 : x
2. Step 2: Convert to fraction form
   105,999.30/146,408.31 = 79,260.12/x
3. Step 3: Cross multiply
   105,999.30x = 146,408.31 × 79,260.12
4. Step 4: Simplify right side
   105,999.30x = 11,604,340,219.60
5. Step 5: Solve for x
   x = 11,604,340,219.60/105,999.30
6. Step 6: Final answer
   x = 109,475.63