Finding the Fourth Proportional to 105,291.86, 144,936.61 and 91,839.68

Step by Step Solution

1. Step 1: Write the proportion equation
   105,291.86 : 144,936.61 = 91,839.68 : x
2. Step 2: Convert to fraction form
   105,291.86/144,936.61 = 91,839.68/x
3. Step 3: Cross multiply
   105,291.86x = 144,936.61 × 91,839.68
4. Step 4: Simplify right side
   105,291.86x = 13,310,931,471.91
5. Step 5: Solve for x
   x = 13,310,931,471.91/105,291.86
6. Step 6: Final answer
   x = 126,419.38