Finding the Fourth Proportional to 123,443.25, 170,425.11 and 78,160.05

Step by Step Solution

1. Step 1: Write the proportion equation
   123,443.25 : 170,425.11 = 78,160.05 : x
2. Step 2: Convert to fraction form
   123,443.25/170,425.11 = 78,160.05/x
3. Step 3: Cross multiply
   123,443.25x = 170,425.11 × 78,160.05
4. Step 4: Simplify right side
   123,443.25x = 13,320,434,992.14
5. Step 5: Solve for x
   x = 13,320,434,992.14/123,443.25
6. Step 6: Final answer
   x = 107,907.36