Finding the Fourth Proportional to 123,488.38, 170,397.66 and 78,086.26

Step by Step Solution

1. Step 1: Write the proportion equation
   123,488.38 : 170,397.66 = 78,086.26 : x
2. Step 2: Convert to fraction form
   123,488.38/170,397.66 = 78,086.26/x
3. Step 3: Cross multiply
   123,488.38x = 170,397.66 × 78,086.26
4. Step 4: Simplify right side
   123,488.38x = 13,305,715,982.15
5. Step 5: Solve for x
   x = 13,305,715,982.15/123,488.38
6. Step 6: Final answer
   x = 107,748.73