Finding the Fourth Proportional to 105,141.29, 144,726.68 and 91,688.81

Step by Step Solution

1. Step 1: Write the proportion equation
   105,141.29 : 144,726.68 = 91,688.81 : x
2. Step 2: Convert to fraction form
   105,141.29/144,726.68 = 91,688.81/x
3. Step 3: Cross multiply
   105,141.29x = 144,726.68 × 91,688.81
4. Step 4: Simplify right side
   105,141.29x = 13,269,816,570.04
5. Step 5: Solve for x
   x = 13,269,816,570.04/105,141.29
6. Step 6: Final answer
   x = 126,209.38