Finding the Fourth Proportional to 9,730.72, 13,420.56 and 8,809.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,730.72 : 13,420.56 = 8,809.12 : x
2. Step 2: Convert to fraction form
   9,730.72/13,420.56 = 8,809.12/x
3. Step 3: Cross multiply
   9,730.72x = 13,420.56 × 8,809.12
4. Step 4: Simplify right side
   9,730.72x = 118,223,323.51
5. Step 5: Solve for x
   x = 118,223,323.51/9,730.72
6. Step 6: Final answer
   x = 12,149.49