Finding the Fourth Proportional to 105,873.89, 158,049.27 and 90,717.81

Step by Step Solution

1. Step 1: Write the proportion equation
   105,873.89 : 158,049.27 = 90,717.81 : x
2. Step 2: Convert to fraction form
   105,873.89/158,049.27 = 90,717.81/x
3. Step 3: Cross multiply
   105,873.89x = 158,049.27 × 90,717.81
4. Step 4: Simplify right side
   105,873.89x = 14,337,883,646.50
5. Step 5: Solve for x
   x = 14,337,883,646.50/105,873.89
6. Step 6: Final answer
   x = 135,424.17