Finding the Fourth Proportional to 9,311.79, 12,849.94 and 5,120.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,311.79 : 12,849.94 = 5,120.01 : x
2. Step 2: Convert to fraction form
   9,311.79/12,849.94 = 5,120.01/x
3. Step 3: Cross multiply
   9,311.79x = 12,849.94 × 5,120.01
4. Step 4: Simplify right side
   9,311.79x = 65,791,821.30
5. Step 5: Solve for x
   x = 65,791,821.30/9,311.79
6. Step 6: Final answer
   x = 7,065.43