Finding the Fourth Proportional to 12,587.06, 17,365.82 and 7,805.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,587.06 : 17,365.82 = 7,805.28 : x
2. Step 2: Convert to fraction form
   12,587.06/17,365.82 = 7,805.28/x
3. Step 3: Cross multiply
   12,587.06x = 17,365.82 × 7,805.28
4. Step 4: Simplify right side
   12,587.06x = 135,545,087.53
5. Step 5: Solve for x
   x = 135,545,087.53/12,587.06
6. Step 6: Final answer
   x = 10,768.61