Finding the Fourth Proportional to 9,664.72, 13,338.16 and 5,415.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,664.72 : 13,338.16 = 5,415.72 : x
2. Step 2: Convert to fraction form
   9,664.72/13,338.16 = 5,415.72/x
3. Step 3: Cross multiply
   9,664.72x = 13,338.16 × 5,415.72
4. Step 4: Simplify right side
   9,664.72x = 72,235,739.88
5. Step 5: Solve for x
   x = 72,235,739.88/9,664.72
6. Step 6: Final answer
   x = 7,474.17