Finding the Fourth Proportional to 7,086.36, 9,780.06 and 5,404.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.36 : 9,780.06 = 5,404.80 : x
2. Step 2: Convert to fraction form
   7,086.36/9,780.06 = 5,404.80/x
3. Step 3: Cross multiply
   7,086.36x = 9,780.06 × 5,404.80
4. Step 4: Simplify right side
   7,086.36x = 52,859,268.29
5. Step 5: Solve for x
   x = 52,859,268.29/7,086.36
6. Step 6: Final answer
   x = 7,459.30