Finding the Fourth Proportional to 7,109.91, 9,810.72 and 3,966.30

Step by Step Solution

1. Step 1: Write the proportion equation
   7,109.91 : 9,810.72 = 3,966.30 : x
2. Step 2: Convert to fraction form
   7,109.91/9,810.72 = 3,966.30/x
3. Step 3: Cross multiply
   7,109.91x = 9,810.72 × 3,966.30
4. Step 4: Simplify right side
   7,109.91x = 38,912,258.74
5. Step 5: Solve for x
   x = 38,912,258.74/7,109.91
6. Step 6: Final answer
   x = 5,472.96