Finding the Fourth Proportional to 9,078.10, 12,722.30 and 9,078.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,078.10 : 12,722.30 = 9,078.10 : x
2. Step 2: Convert to fraction form
   9,078.10/12,722.30 = 9,078.10/x
3. Step 3: Cross multiply
   9,078.10x = 12,722.30 × 9,078.10
4. Step 4: Simplify right side
   9,078.10x = 115,494,311.63
5. Step 5: Solve for x
   x = 115,494,311.63/9,078.10
6. Step 6: Final answer
   x = 12,722.30