Finding the Fourth Proportional to 7,131.62, 9,840.56 and 4,065.50

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.62 : 9,840.56 = 4,065.50 : x
2. Step 2: Convert to fraction form
   7,131.62/9,840.56 = 4,065.50/x
3. Step 3: Cross multiply
   7,131.62x = 9,840.56 × 4,065.50
4. Step 4: Simplify right side
   7,131.62x = 40,006,796.68
5. Step 5: Solve for x
   x = 40,006,796.68/7,131.62
6. Step 6: Final answer
   x = 5,609.78