Finding the Fourth Proportional to 7,705.20, 10,629.72 and 5,216.88

Step by Step Solution

1. Step 1: Write the proportion equation
   7,705.20 : 10,629.72 = 5,216.88 : x
2. Step 2: Convert to fraction form
   7,705.20/10,629.72 = 5,216.88/x
3. Step 3: Cross multiply
   7,705.20x = 10,629.72 × 5,216.88
4. Step 4: Simplify right side
   7,705.20x = 55,453,973.67
5. Step 5: Solve for x
   x = 55,453,973.67/7,705.20
6. Step 6: Final answer
   x = 7,196.95