Finding the Fourth Proportional to 105,886.40, 146,191.61 and 65,643.17

Step by Step Solution

1. Step 1: Write the proportion equation
   105,886.40 : 146,191.61 = 65,643.17 : x
2. Step 2: Convert to fraction form
   105,886.40/146,191.61 = 65,643.17/x
3. Step 3: Cross multiply
   105,886.40x = 146,191.61 × 65,643.17
4. Step 4: Simplify right side
   105,886.40x = 9,596,480,707.80
5. Step 5: Solve for x
   x = 9,596,480,707.80/105,886.40
6. Step 6: Final answer
   x = 90,629.96