Finding the Fourth Proportional to 123,565, 170,537.91 and 78,247.12

Step by Step Solution

1. Step 1: Write the proportion equation
   123,565 : 170,537.91 = 78,247.12 : x
2. Step 2: Convert to fraction form
   123,565/170,537.91 = 78,247.12/x
3. Step 3: Cross multiply
   123,565x = 170,537.91 × 78,247.12
4. Step 4: Simplify right side
   123,565x = 13,344,100,308.32
5. Step 5: Solve for x
   x = 13,344,100,308.32/123,565
6. Step 6: Final answer
   x = 107,992.56