Finding the Fourth Proportional to 105,644.41, 145,705.31 and 89,781.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105,644.41 : 145,705.31 = 89,781.37 : x
2. Step 2: Convert to fraction form
   105,644.41/145,705.31 = 89,781.37/x
3. Step 3: Cross multiply
   105,644.41x = 145,705.31 × 89,781.37
4. Step 4: Simplify right side
   105,644.41x = 13,081,621,899.17
5. Step 5: Solve for x
   x = 13,081,621,899.17/105,644.41
6. Step 6: Final answer
   x = 123,826.92