Finding the Fourth Proportional to 12,840.18, 17,715.69 and 7,535.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840.18 : 17,715.69 = 7,535.22 : x
2. Step 2: Convert to fraction form
   12,840.18/17,715.69 = 7,535.22/x
3. Step 3: Cross multiply
   12,840.18x = 17,715.69 × 7,535.22
4. Step 4: Simplify right side
   12,840.18x = 133,491,621.60
5. Step 5: Solve for x
   x = 133,491,621.60/12,840.18
6. Step 6: Final answer
   x = 10,396.40