Finding the Fourth Proportional to 8,218.48, 12,300.72 and 7,430.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,218.48 : 12,300.72 = 7,430.80 : x
2. Step 2: Convert to fraction form
   8,218.48/12,300.72 = 7,430.80/x
3. Step 3: Cross multiply
   8,218.48x = 12,300.72 × 7,430.80
4. Step 4: Simplify right side
   8,218.48x = 91,404,190.18
5. Step 5: Solve for x
   x = 91,404,190.18/8,218.48
6. Step 6: Final answer
   x = 11,121.79