Finding the Fourth Proportional to 9,721.68, 13,417.20 and 5,529.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,721.68 : 13,417.20 = 5,529.12 : x
2. Step 2: Convert to fraction form
   9,721.68/13,417.20 = 5,529.12/x
3. Step 3: Cross multiply
   9,721.68x = 13,417.20 × 5,529.12
4. Step 4: Simplify right side
   9,721.68x = 74,185,308.86
5. Step 5: Solve for x
   x = 74,185,308.86/9,721.68
6. Step 6: Final answer
   x = 7,630.91