Finding the Fourth Proportional to 7,116.22, 9,819.69 and 3,972.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,116.22 : 9,819.69 = 3,972.61 : x
2. Step 2: Convert to fraction form
   7,116.22/9,819.69 = 3,972.61/x
3. Step 3: Cross multiply
   7,116.22x = 9,819.69 × 3,972.61
4. Step 4: Simplify right side
   7,116.22x = 39,009,798.69
5. Step 5: Solve for x
   x = 39,009,798.69/7,116.22
6. Step 6: Final answer
   x = 5,481.81