Finding the Fourth Proportional to 106,993.51, 159,787.69 and 85,965.50

Step by Step Solution

1. Step 1: Write the proportion equation
   106,993.51 : 159,787.69 = 85,965.50 : x
2. Step 2: Convert to fraction form
   106,993.51/159,787.69 = 85,965.50/x
3. Step 3: Cross multiply
   106,993.51x = 159,787.69 × 85,965.50
4. Step 4: Simplify right side
   106,993.51x = 13,736,228,849.25
5. Step 5: Solve for x
   x = 13,736,228,849.25/106,993.51
6. Step 6: Final answer
   x = 128,383.76