Finding the Fourth Proportional to 9,388.80, 12,954.60 and 7,146.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,388.80 : 12,954.60 = 7,146.72 : x
2. Step 2: Convert to fraction form
   9,388.80/12,954.60 = 7,146.72/x
3. Step 3: Cross multiply
   9,388.80x = 12,954.60 × 7,146.72
4. Step 4: Simplify right side
   9,388.80x = 92,582,898.91
5. Step 5: Solve for x
   x = 92,582,898.91/9,388.80
6. Step 6: Final answer
   x = 9,860.99