Finding the Fourth Proportional to 9,077.80, 12,216.15 and 9,077.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,077.80 : 12,216.15 = 9,077.80 : x
2. Step 2: Convert to fraction form
   9,077.80/12,216.15 = 9,077.80/x
3. Step 3: Cross multiply
   9,077.80x = 12,216.15 × 9,077.80
4. Step 4: Simplify right side
   9,077.80x = 110,895,766.47
5. Step 5: Solve for x
   x = 110,895,766.47/9,077.80
6. Step 6: Final answer
   x = 12,216.15