Finding the Fourth Proportional to 9,109.40, 12,556.20 and 7,116.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.40 : 12,556.20 = 7,116.48 : x
2. Step 2: Convert to fraction form
   9,109.40/12,556.20 = 7,116.48/x
3. Step 3: Cross multiply
   9,109.40x = 12,556.20 × 7,116.48
4. Step 4: Simplify right side
   9,109.40x = 89,355,946.18
5. Step 5: Solve for x
   x = 89,355,946.18/9,109.40
6. Step 6: Final answer
   x = 9,809.20