Finding the Fourth Proportional to 12,710.25, 17,540.15 and 7,742.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,710.25 : 17,540.15 = 7,742.25 : x
2. Step 2: Convert to fraction form
   12,710.25/17,540.15 = 7,742.25/x
3. Step 3: Cross multiply
   12,710.25x = 17,540.15 × 7,742.25
4. Step 4: Simplify right side
   12,710.25x = 135,800,187.63
5. Step 5: Solve for x
   x = 135,800,187.63/12,710.25
6. Step 6: Final answer
   x = 10,684.31