Finding the Fourth Proportional to 13,405.82, 18,500.91 and 7,740.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.82 : 18,500.91 = 7,740.81 : x
2. Step 2: Convert to fraction form
   13,405.82/18,500.91 = 7,740.81/x
3. Step 3: Cross multiply
   13,405.82x = 18,500.91 × 7,740.81
4. Step 4: Simplify right side
   13,405.82x = 143,211,963.53
5. Step 5: Solve for x
   x = 143,211,963.53/13,405.82
6. Step 6: Final answer
   x = 10,682.82