Finding the Fourth Proportional to 7,134.50, 9,845.89 and 3,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   7,134.50 : 9,845.89 = 3,990.69 : x
2. Step 2: Convert to fraction form
   7,134.50/9,845.89 = 3,990.69/x
3. Step 3: Cross multiply
   7,134.50x = 9,845.89 × 3,990.69
4. Step 4: Simplify right side
   7,134.50x = 39,291,884.79
5. Step 5: Solve for x
   x = 39,291,884.79/7,134.50
6. Step 6: Final answer
   x = 5,507.31