Finding the Fourth Proportional to 7,109.39, 9,810.98 and 3,965.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.39 : 9,810.98 = 3,965.78 : x
2. Step 2: Convert to fraction form
   7,109.39/9,810.98 = 3,965.78/x
3. Step 3: Cross multiply
   7,109.39x = 9,810.98 × 3,965.78
4. Step 4: Simplify right side
   7,109.39x = 38,908,119.38
5. Step 5: Solve for x
   x = 38,908,119.38/7,109.39
6. Step 6: Final answer
   x = 5,472.78