Finding the Fourth Proportional to 105,763.92, 158,781.16 and 90,866.37

Step by Step Solution

1. Step 1: Write the proportion equation
   105,763.92 : 158,781.16 = 90,866.37 : x
2. Step 2: Convert to fraction form
   105,763.92/158,781.16 = 90,866.37/x
3. Step 3: Cross multiply
   105,763.92x = 158,781.16 × 90,866.37
4. Step 4: Simplify right side
   105,763.92x = 14,427,867,633.59
5. Step 5: Solve for x
   x = 14,427,867,633.59/105,763.92
6. Step 6: Final answer
   x = 136,415.78