Finding the Fourth Proportional to 7,640.42, 10,464.76 and 7,192.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,640.42 : 10,464.76 = 7,192.10 : x
2. Step 2: Convert to fraction form
   7,640.42/10,464.76 = 7,192.10/x
3. Step 3: Cross multiply
   7,640.42x = 10,464.76 × 7,192.10
4. Step 4: Simplify right side
   7,640.42x = 75,263,600.40
5. Step 5: Solve for x
   x = 75,263,600.40/7,640.42
6. Step 6: Final answer
   x = 9,850.72