Finding the Fourth Proportional to 105,429.32, 145,540.02 and 67,240.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,429.32 : 145,540.02 = 67,240.16 : x
2. Step 2: Convert to fraction form
   105,429.32/145,540.02 = 67,240.16/x
3. Step 3: Cross multiply
   105,429.32x = 145,540.02 × 67,240.16
4. Step 4: Simplify right side
   105,429.32x = 9,786,134,231.20
5. Step 5: Solve for x
   x = 9,786,134,231.20/105,429.32
6. Step 6: Final answer
   x = 92,821.75