Finding the Fourth Proportional to 105,971.15, 146,139.53 and 69,608.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,971.15 : 146,139.53 = 69,608.18 : x
2. Step 2: Convert to fraction form
   105,971.15/146,139.53 = 69,608.18/x
3. Step 3: Cross multiply
   105,971.15x = 146,139.53 × 69,608.18
4. Step 4: Simplify right side
   105,971.15x = 10,172,505,630.62
5. Step 5: Solve for x
   x = 10,172,505,630.62/105,971.15
6. Step 6: Final answer
   x = 95,993.17