Finding the Fourth Proportional to 13,707.82, 18,917.31 and 7,740.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,707.82 : 18,917.31 = 7,740.15 : x
2. Step 2: Convert to fraction form
   13,707.82/18,917.31 = 7,740.15/x
3. Step 3: Cross multiply
   13,707.82x = 18,917.31 × 7,740.15
4. Step 4: Simplify right side
   13,707.82x = 146,422,817.00
5. Step 5: Solve for x
   x = 146,422,817.00/13,707.82
6. Step 6: Final answer
   x = 10,681.70