Finding the Fourth Proportional to 123,633.09, 170,540.52 and 78,921.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123,633.09 : 170,540.52 = 78,921.09 : x
2. Step 2: Convert to fraction form
   123,633.09/170,540.52 = 78,921.09/x
3. Step 3: Cross multiply
   123,633.09x = 170,540.52 × 78,921.09
4. Step 4: Simplify right side
   123,633.09x = 13,459,243,727.57
5. Step 5: Solve for x
   x = 13,459,243,727.57/123,633.09
6. Step 6: Final answer
   x = 108,864.41