Finding the Fourth Proportional to 9,112.80, 12,493.65 and 8,946.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,112.80 : 12,493.65 = 8,946.72 : x
2. Step 2: Convert to fraction form
   9,112.80/12,493.65 = 8,946.72/x
3. Step 3: Cross multiply
   9,112.80x = 12,493.65 × 8,946.72
4. Step 4: Simplify right side
   9,112.80x = 111,777,143.59
5. Step 5: Solve for x
   x = 111,777,143.59/9,112.80
6. Step 6: Final answer
   x = 12,265.95