Finding the Fourth Proportional to 9,300.79, 12,836.60 and 7,179.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,300.79 : 12,836.60 = 7,179.40 : x
2. Step 2: Convert to fraction form
   9,300.79/12,836.60 = 7,179.40/x
3. Step 3: Cross multiply
   9,300.79x = 12,836.60 × 7,179.40
4. Step 4: Simplify right side
   9,300.79x = 92,159,086.04
5. Step 5: Solve for x
   x = 92,159,086.04/9,300.79
6. Step 6: Final answer
   x = 9,908.74